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Finding the Fourth Proportional to 1,127.66, 1,691.66 and 397.11

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Solution

The fourth proportional to 1,127.66, 1,691.66 and 397.11 is: 595.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.66 : 1,691.66 = 397.11 : x
  2. Step 2: Convert to fraction form
    1,127.66/1,691.66 = 397.11/x
  3. Step 3: Cross multiply
    1,127.66x = 1,691.66 × 397.11
  4. Step 4: Simplify right side
    1,127.66x = 671,764.66
  5. Step 5: Solve for x
    x = 671,764.66/1,127.66
  6. Step 6: Final answer
    x = 595.72

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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.