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Finding the Fourth Proportional to 691.20, 1,031.40 and 674.73

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Solution

The fourth proportional to 691.20, 1,031.40 and 674.73 is: 1,006.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.20 : 1,031.40 = 674.73 : x
  2. Step 2: Convert to fraction form
    691.20/1,031.40 = 674.73/x
  3. Step 3: Cross multiply
    691.20x = 1,031.40 × 674.73
  4. Step 4: Simplify right side
    691.20x = 695,916.52
  5. Step 5: Solve for x
    x = 695,916.52/691.20
  6. Step 6: Final answer
    x = 1,006.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.