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Finding the Fourth Proportional to 721.53, 1,082.31 and 432.75

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Solution

The fourth proportional to 721.53, 1,082.31 and 432.75 is: 649.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.53 : 1,082.31 = 432.75 : x
  2. Step 2: Convert to fraction form
    721.53/1,082.31 = 432.75/x
  3. Step 3: Cross multiply
    721.53x = 1,082.31 × 432.75
  4. Step 4: Simplify right side
    721.53x = 468,369.65
  5. Step 5: Solve for x
    x = 468,369.65/721.53
  6. Step 6: Final answer
    x = 649.13

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Double scale
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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.