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Finding the Fourth Proportional to 691.90, 1,037.15 and 344.70

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Solution

The fourth proportional to 691.90, 1,037.15 and 344.70 is: 516.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.90 : 1,037.15 = 344.70 : x
  2. Step 2: Convert to fraction form
    691.90/1,037.15 = 344.70/x
  3. Step 3: Cross multiply
    691.90x = 1,037.15 × 344.70
  4. Step 4: Simplify right side
    691.90x = 357,505.61
  5. Step 5: Solve for x
    x = 357,505.61/691.90
  6. Step 6: Final answer
    x = 516.70

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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.