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Finding the Fourth Proportional to 815.52, 1,124.88 and 553.68

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Solution

The fourth proportional to 815.52, 1,124.88 and 553.68 is: 763.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.52 : 1,124.88 = 553.68 : x
  2. Step 2: Convert to fraction form
    815.52/1,124.88 = 553.68/x
  3. Step 3: Cross multiply
    815.52x = 1,124.88 × 553.68
  4. Step 4: Simplify right side
    815.52x = 622,823.56
  5. Step 5: Solve for x
    x = 622,823.56/815.52
  6. Step 6: Final answer
    x = 763.71

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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.