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Finding the Fourth Proportional to 89.92, 134.36 and 67.14

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Solution

The fourth proportional to 89.92, 134.36 and 67.14 is: 100.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.92 : 134.36 = 67.14 : x
  2. Step 2: Convert to fraction form
    89.92/134.36 = 67.14/x
  3. Step 3: Cross multiply
    89.92x = 134.36 × 67.14
  4. Step 4: Simplify right side
    89.92x = 9,020.93
  5. Step 5: Solve for x
    x = 9,020.93/89.92
  6. Step 6: Final answer
    x = 100.32

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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.