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Finding the Fourth Proportional to 89.85, 134.92 and 55.81

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Solution

The fourth proportional to 89.85, 134.92 and 55.81 is: 83.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.85 : 134.92 = 55.81 : x
  2. Step 2: Convert to fraction form
    89.85/134.92 = 55.81/x
  3. Step 3: Cross multiply
    89.85x = 134.92 × 55.81
  4. Step 4: Simplify right side
    89.85x = 7,529.89
  5. Step 5: Solve for x
    x = 7,529.89/89.85
  6. Step 6: Final answer
    x = 83.81

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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.