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Finding the Fourth Proportional to 121.60, 182.05 and 75.84

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Solution

The fourth proportional to 121.60, 182.05 and 75.84 is: 113.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.60 : 182.05 = 75.84 : x
  2. Step 2: Convert to fraction form
    121.60/182.05 = 75.84/x
  3. Step 3: Cross multiply
    121.60x = 182.05 × 75.84
  4. Step 4: Simplify right side
    121.60x = 13,805.80
  5. Step 5: Solve for x
    x = 13,805.80/121.60
  6. Step 6: Final answer
    x = 113.53

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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.