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Finding the Fourth Proportional to 89.85, 134.76 and 85.29

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Solution

The fourth proportional to 89.85, 134.76 and 85.29 is: 127.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.85 : 134.76 = 85.29 : x
  2. Step 2: Convert to fraction form
    89.85/134.76 = 85.29/x
  3. Step 3: Cross multiply
    89.85x = 134.76 × 85.29
  4. Step 4: Simplify right side
    89.85x = 11,493.68
  5. Step 5: Solve for x
    x = 11,493.68/89.85
  6. Step 6: Final answer
    x = 127.92

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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.