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Finding the Fourth Proportional to 101.92, 140.64 and 82.56

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Solution

The fourth proportional to 101.92, 140.64 and 82.56 is: 113.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.92 : 140.64 = 82.56 : x
  2. Step 2: Convert to fraction form
    101.92/140.64 = 82.56/x
  3. Step 3: Cross multiply
    101.92x = 140.64 × 82.56
  4. Step 4: Simplify right side
    101.92x = 11,611.24
  5. Step 5: Solve for x
    x = 11,611.24/101.92
  6. Step 6: Final answer
    x = 113.93

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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.