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Finding the Fourth Proportional to 1,005.82, 1,387.39 and 725.61

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Solution

The fourth proportional to 1,005.82, 1,387.39 and 725.61 is: 1,000.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.82 : 1,387.39 = 725.61 : x
  2. Step 2: Convert to fraction form
    1,005.82/1,387.39 = 725.61/x
  3. Step 3: Cross multiply
    1,005.82x = 1,387.39 × 725.61
  4. Step 4: Simplify right side
    1,005.82x = 1,006,704.06
  5. Step 5: Solve for x
    x = 1,006,704.06/1,005.82
  6. Step 6: Final answer
    x = 1,000.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.