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Finding the Fourth Proportional to 915.17, 1,372.75 and 265.91

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Solution

The fourth proportional to 915.17, 1,372.75 and 265.91 is: 398.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.17 : 1,372.75 = 265.91 : x
  2. Step 2: Convert to fraction form
    915.17/1,372.75 = 265.91/x
  3. Step 3: Cross multiply
    915.17x = 1,372.75 × 265.91
  4. Step 4: Simplify right side
    915.17x = 365,020.42
  5. Step 5: Solve for x
    x = 365,020.42/915.17
  6. Step 6: Final answer
    x = 398.86

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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.