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Finding the Fourth Proportional to 686.60, 1,032.60 and 616.40

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Solution

The fourth proportional to 686.60, 1,032.60 and 616.40 is: 927.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.60 : 1,032.60 = 616.40 : x
  2. Step 2: Convert to fraction form
    686.60/1,032.60 = 616.40/x
  3. Step 3: Cross multiply
    686.60x = 1,032.60 × 616.40
  4. Step 4: Simplify right side
    686.60x = 636,494.64
  5. Step 5: Solve for x
    x = 636,494.64/686.60
  6. Step 6: Final answer
    x = 927.02

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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.