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Finding the Fourth Proportional to 1,127.70, 1,691.37 and 397.08

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Solution

The fourth proportional to 1,127.70, 1,691.37 and 397.08 is: 595.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.70 : 1,691.37 = 397.08 : x
  2. Step 2: Convert to fraction form
    1,127.70/1,691.37 = 397.08/x
  3. Step 3: Cross multiply
    1,127.70x = 1,691.37 × 397.08
  4. Step 4: Simplify right side
    1,127.70x = 671,609.20
  5. Step 5: Solve for x
    x = 671,609.20/1,127.70
  6. Step 6: Final answer
    x = 595.56

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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.