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Finding the Fourth Proportional to 1,251.63, 1,873.95 and 813.36

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Solution

The fourth proportional to 1,251.63, 1,873.95 and 813.36 is: 1,217.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.63 : 1,873.95 = 813.36 : x
  2. Step 2: Convert to fraction form
    1,251.63/1,873.95 = 813.36/x
  3. Step 3: Cross multiply
    1,251.63x = 1,873.95 × 813.36
  4. Step 4: Simplify right side
    1,251.63x = 1,524,195.97
  5. Step 5: Solve for x
    x = 1,524,195.97/1,251.63
  6. Step 6: Final answer
    x = 1,217.77

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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.