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Finding the Fourth Proportional to 915.44, 1,372.24 and 453.55

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Solution

The fourth proportional to 915.44, 1,372.24 and 453.55 is: 679.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.44 : 1,372.24 = 453.55 : x
  2. Step 2: Convert to fraction form
    915.44/1,372.24 = 453.55/x
  3. Step 3: Cross multiply
    915.44x = 1,372.24 × 453.55
  4. Step 4: Simplify right side
    915.44x = 622,384.95
  5. Step 5: Solve for x
    x = 622,384.95/915.44
  6. Step 6: Final answer
    x = 679.88

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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.