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Finding the Fourth Proportional to 915.13, 1,372.55 and 256.95

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Solution

The fourth proportional to 915.13, 1,372.55 and 256.95 is: 385.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.13 : 1,372.55 = 256.95 : x
  2. Step 2: Convert to fraction form
    915.13/1,372.55 = 256.95/x
  3. Step 3: Cross multiply
    915.13x = 1,372.55 × 256.95
  4. Step 4: Simplify right side
    915.13x = 352,675.44
  5. Step 5: Solve for x
    x = 352,675.44/915.13
  6. Step 6: Final answer
    x = 385.38

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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.