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Finding the Fourth Proportional to 10.72, 14.78 and 9.92

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Solution

The fourth proportional to 10.72, 14.78 and 9.92 is: 13.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.72 : 14.78 = 9.92 : x
  2. Step 2: Convert to fraction form
    10.72/14.78 = 9.92/x
  3. Step 3: Cross multiply
    10.72x = 14.78 × 9.92
  4. Step 4: Simplify right side
    10.72x = 146.62
  5. Step 5: Solve for x
    x = 146.62/10.72
  6. Step 6: Final answer
    x = 13.68

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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.