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Finding the Fourth Proportional to 915.62, 1,373.96 and 338.90

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Solution

The fourth proportional to 915.62, 1,373.96 and 338.90 is: 508.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.62 : 1,373.96 = 338.90 : x
  2. Step 2: Convert to fraction form
    915.62/1,373.96 = 338.90/x
  3. Step 3: Cross multiply
    915.62x = 1,373.96 × 338.90
  4. Step 4: Simplify right side
    915.62x = 465,629.02
  5. Step 5: Solve for x
    x = 465,629.02/915.62
  6. Step 6: Final answer
    x = 508.54

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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.