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Finding the Fourth Proportional to 915.87, 1,372.98 and 330.74

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Solution

The fourth proportional to 915.87, 1,372.98 and 330.74 is: 495.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.87 : 1,372.98 = 330.74 : x
  2. Step 2: Convert to fraction form
    915.87/1,372.98 = 330.74/x
  3. Step 3: Cross multiply
    915.87x = 1,372.98 × 330.74
  4. Step 4: Simplify right side
    915.87x = 454,092.54
  5. Step 5: Solve for x
    x = 454,092.54/915.87
  6. Step 6: Final answer
    x = 495.80

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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.