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Finding the Fourth Proportional to 89.91, 135.14 and 79.92

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Solution

The fourth proportional to 89.91, 135.14 and 79.92 is: 120.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.91 : 135.14 = 79.92 : x
  2. Step 2: Convert to fraction form
    89.91/135.14 = 79.92/x
  3. Step 3: Cross multiply
    89.91x = 135.14 × 79.92
  4. Step 4: Simplify right side
    89.91x = 10,799.99
  5. Step 5: Solve for x
    x = 10,799.99/89.91
  6. Step 6: Final answer
    x = 120.12

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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.