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Finding the Fourth Proportional to 1,251.17, 1,879.82 and 813.30

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Solution

The fourth proportional to 1,251.17, 1,879.82 and 813.30 is: 1,221.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.17 : 1,879.82 = 813.30 : x
  2. Step 2: Convert to fraction form
    1,251.17/1,879.82 = 813.30/x
  3. Step 3: Cross multiply
    1,251.17x = 1,879.82 × 813.30
  4. Step 4: Simplify right side
    1,251.17x = 1,528,857.61
  5. Step 5: Solve for x
    x = 1,528,857.61/1,251.17
  6. Step 6: Final answer
    x = 1,221.94

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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.