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Finding the Fourth Proportional to 691.68, 1,037.18 and 432.02

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Solution

The fourth proportional to 691.68, 1,037.18 and 432.02 is: 647.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.68 : 1,037.18 = 432.02 : x
  2. Step 2: Convert to fraction form
    691.68/1,037.18 = 432.02/x
  3. Step 3: Cross multiply
    691.68x = 1,037.18 × 432.02
  4. Step 4: Simplify right side
    691.68x = 448,082.50
  5. Step 5: Solve for x
    x = 448,082.50/691.68
  6. Step 6: Final answer
    x = 647.82

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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.