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Finding the Fourth Proportional to 691.28, 1,037.40 and 434.96

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Solution

The fourth proportional to 691.28, 1,037.40 and 434.96 is: 652.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.28 : 1,037.40 = 434.96 : x
  2. Step 2: Convert to fraction form
    691.28/1,037.40 = 434.96/x
  3. Step 3: Cross multiply
    691.28x = 1,037.40 × 434.96
  4. Step 4: Simplify right side
    691.28x = 451,227.50
  5. Step 5: Solve for x
    x = 451,227.50/691.28
  6. Step 6: Final answer
    x = 652.74

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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.