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Finding the Fourth Proportional to 932, 1,286.20 and 518

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Solution

The fourth proportional to 932, 1,286.20 and 518 is: 714.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    932 : 1,286.20 = 518 : x
  2. Step 2: Convert to fraction form
    932/1,286.20 = 518/x
  3. Step 3: Cross multiply
    932x = 1,286.20 × 518
  4. Step 4: Simplify right side
    932x = 666,251.60
  5. Step 5: Solve for x
    x = 666,251.60/932
  6. Step 6: Final answer
    x = 714.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.