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Finding the Fourth Proportional to 88.95, 132.80 and 80.31

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Solution

The fourth proportional to 88.95, 132.80 and 80.31 is: 119.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.95 : 132.80 = 80.31 : x
  2. Step 2: Convert to fraction form
    88.95/132.80 = 80.31/x
  3. Step 3: Cross multiply
    88.95x = 132.80 × 80.31
  4. Step 4: Simplify right side
    88.95x = 10,665.17
  5. Step 5: Solve for x
    x = 10,665.17/88.95
  6. Step 6: Final answer
    x = 119.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.