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Finding the Fourth Proportional to 686.92, 1,031.54 and 656.12

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Solution

The fourth proportional to 686.92, 1,031.54 and 656.12 is: 985.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.92 : 1,031.54 = 656.12 : x
  2. Step 2: Convert to fraction form
    686.92/1,031.54 = 656.12/x
  3. Step 3: Cross multiply
    686.92x = 1,031.54 × 656.12
  4. Step 4: Simplify right side
    686.92x = 676,814.02
  5. Step 5: Solve for x
    x = 676,814.02/686.92
  6. Step 6: Final answer
    x = 985.29

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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.