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Finding the Fourth Proportional to 89.91, 134.66 and 80.19

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Solution

The fourth proportional to 89.91, 134.66 and 80.19 is: 120.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.91 : 134.66 = 80.19 : x
  2. Step 2: Convert to fraction form
    89.91/134.66 = 80.19/x
  3. Step 3: Cross multiply
    89.91x = 134.66 × 80.19
  4. Step 4: Simplify right side
    89.91x = 10,798.59
  5. Step 5: Solve for x
    x = 10,798.59/89.91
  6. Step 6: Final answer
    x = 120.10

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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.