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Finding the Fourth Proportional to 915.10, 1,372.29 and 338.02

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Solution

The fourth proportional to 915.10, 1,372.29 and 338.02 is: 506.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.10 : 1,372.29 = 338.02 : x
  2. Step 2: Convert to fraction form
    915.10/1,372.29 = 338.02/x
  3. Step 3: Cross multiply
    915.10x = 1,372.29 × 338.02
  4. Step 4: Simplify right side
    915.10x = 463,861.47
  5. Step 5: Solve for x
    x = 463,861.47/915.10
  6. Step 6: Final answer
    x = 506.90

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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.