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Finding the Fourth Proportional to 1,249.88, 1,872.12 and 815.72

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Solution

The fourth proportional to 1,249.88, 1,872.12 and 815.72 is: 1,221.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.88 : 1,872.12 = 815.72 : x
  2. Step 2: Convert to fraction form
    1,249.88/1,872.12 = 815.72/x
  3. Step 3: Cross multiply
    1,249.88x = 1,872.12 × 815.72
  4. Step 4: Simplify right side
    1,249.88x = 1,527,125.73
  5. Step 5: Solve for x
    x = 1,527,125.73/1,249.88
  6. Step 6: Final answer
    x = 1,221.82

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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.