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Finding the Fourth Proportional to 89.46, 133.20 and 85.77

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Solution

The fourth proportional to 89.46, 133.20 and 85.77 is: 127.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.46 : 133.20 = 85.77 : x
  2. Step 2: Convert to fraction form
    89.46/133.20 = 85.77/x
  3. Step 3: Cross multiply
    89.46x = 133.20 × 85.77
  4. Step 4: Simplify right side
    89.46x = 11,424.56
  5. Step 5: Solve for x
    x = 11,424.56/89.46
  6. Step 6: Final answer
    x = 127.71

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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.