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Finding the Fourth Proportional to 1,000.80, 1,381.68 and 686.52

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Solution

The fourth proportional to 1,000.80, 1,381.68 and 686.52 is: 947.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.80 : 1,381.68 = 686.52 : x
  2. Step 2: Convert to fraction form
    1,000.80/1,381.68 = 686.52/x
  3. Step 3: Cross multiply
    1,000.80x = 1,381.68 × 686.52
  4. Step 4: Simplify right side
    1,000.80x = 948,550.95
  5. Step 5: Solve for x
    x = 948,550.95/1,000.80
  6. Step 6: Final answer
    x = 947.79

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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.