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Finding the Fourth Proportional to 12.53, 17.28 and 8.15

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Solution

The fourth proportional to 12.53, 17.28 and 8.15 is: 11.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.53 : 17.28 = 8.15 : x
  2. Step 2: Convert to fraction form
    12.53/17.28 = 8.15/x
  3. Step 3: Cross multiply
    12.53x = 17.28 × 8.15
  4. Step 4: Simplify right side
    12.53x = 140.75
  5. Step 5: Solve for x
    x = 140.75/12.53
  6. Step 6: Final answer
    x = 11.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.