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Finding the Fourth Proportional to 1,127.31, 1,691.11 and 396.89

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Solution

The fourth proportional to 1,127.31, 1,691.11 and 396.89 is: 595.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.31 : 1,691.11 = 396.89 : x
  2. Step 2: Convert to fraction form
    1,127.31/1,691.11 = 396.89/x
  3. Step 3: Cross multiply
    1,127.31x = 1,691.11 × 396.89
  4. Step 4: Simplify right side
    1,127.31x = 671,184.65
  5. Step 5: Solve for x
    x = 671,184.65/1,127.31
  6. Step 6: Final answer
    x = 595.39

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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.