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Finding the Fourth Proportional to 815.71, 1,125.18 and 500.43

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Solution

The fourth proportional to 815.71, 1,125.18 and 500.43 is: 690.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.71 : 1,125.18 = 500.43 : x
  2. Step 2: Convert to fraction form
    815.71/1,125.18 = 500.43/x
  3. Step 3: Cross multiply
    815.71x = 1,125.18 × 500.43
  4. Step 4: Simplify right side
    815.71x = 563,067.73
  5. Step 5: Solve for x
    x = 563,067.73/815.71
  6. Step 6: Final answer
    x = 690.28

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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.