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Finding the Fourth Proportional to 815.97, 1,125.45 and 521.13

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Solution

The fourth proportional to 815.97, 1,125.45 and 521.13 is: 718.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.97 : 1,125.45 = 521.13 : x
  2. Step 2: Convert to fraction form
    815.97/1,125.45 = 521.13/x
  3. Step 3: Cross multiply
    815.97x = 1,125.45 × 521.13
  4. Step 4: Simplify right side
    815.97x = 586,505.76
  5. Step 5: Solve for x
    x = 586,505.76/815.97
  6. Step 6: Final answer
    x = 718.78

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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.