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Finding the Fourth Proportional to 915.62, 1,372.71 and 428.42

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Solution

The fourth proportional to 915.62, 1,372.71 and 428.42 is: 642.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.62 : 1,372.71 = 428.42 : x
  2. Step 2: Convert to fraction form
    915.62/1,372.71 = 428.42/x
  3. Step 3: Cross multiply
    915.62x = 1,372.71 × 428.42
  4. Step 4: Simplify right side
    915.62x = 588,096.42
  5. Step 5: Solve for x
    x = 588,096.42/915.62
  6. Step 6: Final answer
    x = 642.29

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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.