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Finding the Fourth Proportional to 89.87, 134.79 and 80.15

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Solution

The fourth proportional to 89.87, 134.79 and 80.15 is: 120.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.87 : 134.79 = 80.15 : x
  2. Step 2: Convert to fraction form
    89.87/134.79 = 80.15/x
  3. Step 3: Cross multiply
    89.87x = 134.79 × 80.15
  4. Step 4: Simplify right side
    89.87x = 10,802.74
  5. Step 5: Solve for x
    x = 10,802.74/89.87
  6. Step 6: Final answer
    x = 120.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.