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Finding the Fourth Proportional to 721.56, 1,080.18 and 432.12

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Solution

The fourth proportional to 721.56, 1,080.18 and 432.12 is: 646.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.56 : 1,080.18 = 432.12 : x
  2. Step 2: Convert to fraction form
    721.56/1,080.18 = 432.12/x
  3. Step 3: Cross multiply
    721.56x = 1,080.18 × 432.12
  4. Step 4: Simplify right side
    721.56x = 466,767.38
  5. Step 5: Solve for x
    x = 466,767.38/721.56
  6. Step 6: Final answer
    x = 646.89

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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.