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Finding the Fourth Proportional to 932.88, 1,399.68 and 660.72

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Solution

The fourth proportional to 932.88, 1,399.68 and 660.72 is: 991.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.88 : 1,399.68 = 660.72 : x
  2. Step 2: Convert to fraction form
    932.88/1,399.68 = 660.72/x
  3. Step 3: Cross multiply
    932.88x = 1,399.68 × 660.72
  4. Step 4: Simplify right side
    932.88x = 924,796.57
  5. Step 5: Solve for x
    x = 924,796.57/932.88
  6. Step 6: Final answer
    x = 991.33

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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.