# Rates – A comparison of two products to see which is cheapest

**Posted:**June 11, 2013

**Filed under:**MTH145, MTH148, Ratio & Proportion, Ratio & Proportion |

**Tags:**Carruthers, comparison, mathcasts, rates Leave a comment

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# Direct Variation – both methods

**Posted:**January 29, 2013

**Filed under:**Application of Skills, MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion |

**Tags:**direct, mathcast, variation Leave a comment

Given y is directly proportional to x and y46 when x62, find y when x17.

# Proportions – Solving for the variable

**Posted:**January 29, 2013

**Filed under:**Application of Skills, MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion |

**Tags:**cross-multiplication, mathcast, proportions, variable Leave a comment

Student solution for solving for x in a proportion by cross-multiplication.

# Proportional Reasoning

**Posted:**January 29, 2013

**Filed under:**MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion, Review |

**Tags:**mathcast, Proportional, Reasoning Leave a comment

Proportional Reasoning

# Solving for x in a proportion

**Posted:**January 29, 2013

**Filed under:**Application of Skills, MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion |

**Tags:**mathcast Leave a comment

Solving for x in a proportion

# Indirect Variation – both methods

**Posted:**January 29, 2013

**Filed under:**Application of Skills, MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion |

**Tags:**indirect variation, mathcast Leave a comment

Given y is indirectly proportional to x and y95 when x54, find y when x17.