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Finding the Fourth Proportional to 1,115.38, 1,669.98 and 725.83

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Solution

The fourth proportional to 1,115.38, 1,669.98 and 725.83 is: 1,086.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.38 : 1,669.98 = 725.83 : x
  2. Step 2: Convert to fraction form
    1,115.38/1,669.98 = 725.83/x
  3. Step 3: Cross multiply
    1,115.38x = 1,669.98 × 725.83
  4. Step 4: Simplify right side
    1,115.38x = 1,212,121.58
  5. Step 5: Solve for x
    x = 1,212,121.58/1,115.38
  6. Step 6: Final answer
    x = 1,086.73

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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.