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Finding the Fourth Proportional to 815.31, 1,221.72 and 754.56

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Solution

The fourth proportional to 815.31, 1,221.72 and 754.56 is: 1,130.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.31 : 1,221.72 = 754.56 : x
  2. Step 2: Convert to fraction form
    815.31/1,221.72 = 754.56/x
  3. Step 3: Cross multiply
    815.31x = 1,221.72 × 754.56
  4. Step 4: Simplify right side
    815.31x = 921,861.04
  5. Step 5: Solve for x
    x = 921,861.04/815.31
  6. Step 6: Final answer
    x = 1,130.69

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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.