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Finding the Fourth Proportional to 1,127.90, 1,691.99 and 397.55

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Solution

The fourth proportional to 1,127.90, 1,691.99 and 397.55 is: 596.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.90 : 1,691.99 = 397.55 : x
  2. Step 2: Convert to fraction form
    1,127.90/1,691.99 = 397.55/x
  3. Step 3: Cross multiply
    1,127.90x = 1,691.99 × 397.55
  4. Step 4: Simplify right side
    1,127.90x = 672,650.62
  5. Step 5: Solve for x
    x = 672,650.62/1,127.90
  6. Step 6: Final answer
    x = 596.37

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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.