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Finding the Fourth Proportional to 100.82, 138.84 and 88.56

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Solution

The fourth proportional to 100.82, 138.84 and 88.56 is: 121.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.82 : 138.84 = 88.56 : x
  2. Step 2: Convert to fraction form
    100.82/138.84 = 88.56/x
  3. Step 3: Cross multiply
    100.82x = 138.84 × 88.56
  4. Step 4: Simplify right side
    100.82x = 12,295.67
  5. Step 5: Solve for x
    x = 12,295.67/100.82
  6. Step 6: Final answer
    x = 121.96

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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.