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Finding the Fourth Proportional to 114.64, 171.82 and 81.96

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Solution

The fourth proportional to 114.64, 171.82 and 81.96 is: 122.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.64 : 171.82 = 81.96 : x
  2. Step 2: Convert to fraction form
    114.64/171.82 = 81.96/x
  3. Step 3: Cross multiply
    114.64x = 171.82 × 81.96
  4. Step 4: Simplify right side
    114.64x = 14,082.16
  5. Step 5: Solve for x
    x = 14,082.16/114.64
  6. Step 6: Final answer
    x = 122.84

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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.