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Finding the Fourth Proportional to 111.28, 153.44 and 71.92

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Solution

The fourth proportional to 111.28, 153.44 and 71.92 is: 99.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.28 : 153.44 = 71.92 : x
  2. Step 2: Convert to fraction form
    111.28/153.44 = 71.92/x
  3. Step 3: Cross multiply
    111.28x = 153.44 × 71.92
  4. Step 4: Simplify right side
    111.28x = 11,035.40
  5. Step 5: Solve for x
    x = 11,035.40/111.28
  6. Step 6: Final answer
    x = 99.17

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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.