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Finding the Fourth Proportional to 667.59, 1,001.20 and 321.15

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Solution

The fourth proportional to 667.59, 1,001.20 and 321.15 is: 481.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.59 : 1,001.20 = 321.15 : x
  2. Step 2: Convert to fraction form
    667.59/1,001.20 = 321.15/x
  3. Step 3: Cross multiply
    667.59x = 1,001.20 × 321.15
  4. Step 4: Simplify right side
    667.59x = 321,535.38
  5. Step 5: Solve for x
    x = 321,535.38/667.59
  6. Step 6: Final answer
    x = 481.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.