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Finding the Fourth Proportional to 88.78, 133.76 and 80.23

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Solution

The fourth proportional to 88.78, 133.76 and 80.23 is: 120.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.78 : 133.76 = 80.23 : x
  2. Step 2: Convert to fraction form
    88.78/133.76 = 80.23/x
  3. Step 3: Cross multiply
    88.78x = 133.76 × 80.23
  4. Step 4: Simplify right side
    88.78x = 10,731.56
  5. Step 5: Solve for x
    x = 10,731.56/88.78
  6. Step 6: Final answer
    x = 120.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.