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Finding the Fourth Proportional to 10.12, 15.20 and 7.24

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Solution

The fourth proportional to 10.12, 15.20 and 7.24 is: 10.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.12 : 15.20 = 7.24 : x
  2. Step 2: Convert to fraction form
    10.12/15.20 = 7.24/x
  3. Step 3: Cross multiply
    10.12x = 15.20 × 7.24
  4. Step 4: Simplify right side
    10.12x = 109.97
  5. Step 5: Solve for x
    x = 109.97/10.12
  6. Step 6: Final answer
    x = 10.86

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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.