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Finding the Fourth Proportional to 1,124.52, 1,687.17 and 686.65

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Solution

The fourth proportional to 1,124.52, 1,687.17 and 686.65 is: 1,030.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.52 : 1,687.17 = 686.65 : x
  2. Step 2: Convert to fraction form
    1,124.52/1,687.17 = 686.65/x
  3. Step 3: Cross multiply
    1,124.52x = 1,687.17 × 686.65
  4. Step 4: Simplify right side
    1,124.52x = 1,158,495.28
  5. Step 5: Solve for x
    x = 1,158,495.28/1,124.52
  6. Step 6: Final answer
    x = 1,030.21

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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.