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Finding the Fourth Proportional to 915.20, 1,372.65 and 265.78

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Solution

The fourth proportional to 915.20, 1,372.65 and 265.78 is: 398.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.20 : 1,372.65 = 265.78 : x
  2. Step 2: Convert to fraction form
    915.20/1,372.65 = 265.78/x
  3. Step 3: Cross multiply
    915.20x = 1,372.65 × 265.78
  4. Step 4: Simplify right side
    915.20x = 364,823.64
  5. Step 5: Solve for x
    x = 364,823.64/915.20
  6. Step 6: Final answer
    x = 398.63

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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.