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Finding the Fourth Proportional to 114.42, 171.78 and 91.80

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Solution

The fourth proportional to 114.42, 171.78 and 91.80 is: 137.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.42 : 171.78 = 91.80 : x
  2. Step 2: Convert to fraction form
    114.42/171.78 = 91.80/x
  3. Step 3: Cross multiply
    114.42x = 171.78 × 91.80
  4. Step 4: Simplify right side
    114.42x = 15,769.40
  5. Step 5: Solve for x
    x = 15,769.40/114.42
  6. Step 6: Final answer
    x = 137.82

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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.