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Finding the Fourth Proportional to 915.26, 1,372.92 and 330.31

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Solution

The fourth proportional to 915.26, 1,372.92 and 330.31 is: 495.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.26 : 1,372.92 = 330.31 : x
  2. Step 2: Convert to fraction form
    915.26/1,372.92 = 330.31/x
  3. Step 3: Cross multiply
    915.26x = 1,372.92 × 330.31
  4. Step 4: Simplify right side
    915.26x = 453,489.21
  5. Step 5: Solve for x
    x = 453,489.21/915.26
  6. Step 6: Final answer
    x = 495.48

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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.