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Finding the Fourth Proportional to 1,127.61, 1,691.40 and 305.90

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Solution

The fourth proportional to 1,127.61, 1,691.40 and 305.90 is: 458.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.61 : 1,691.40 = 305.90 : x
  2. Step 2: Convert to fraction form
    1,127.61/1,691.40 = 305.90/x
  3. Step 3: Cross multiply
    1,127.61x = 1,691.40 × 305.90
  4. Step 4: Simplify right side
    1,127.61x = 517,399.26
  5. Step 5: Solve for x
    x = 517,399.26/1,127.61
  6. Step 6: Final answer
    x = 458.85

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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.