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Finding the Fourth Proportional to 815.74, 1,125.80 and 521.61

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Solution

The fourth proportional to 815.74, 1,125.80 and 521.61 is: 719.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.74 : 1,125.80 = 521.61 : x
  2. Step 2: Convert to fraction form
    815.74/1,125.80 = 521.61/x
  3. Step 3: Cross multiply
    815.74x = 1,125.80 × 521.61
  4. Step 4: Simplify right side
    815.74x = 587,228.54
  5. Step 5: Solve for x
    x = 587,228.54/815.74
  6. Step 6: Final answer
    x = 719.87

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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.