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Finding the Fourth Proportional to 84.62, 127.20 and 75.80

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Solution

The fourth proportional to 84.62, 127.20 and 75.80 is: 113.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.62 : 127.20 = 75.80 : x
  2. Step 2: Convert to fraction form
    84.62/127.20 = 75.80/x
  3. Step 3: Cross multiply
    84.62x = 127.20 × 75.80
  4. Step 4: Simplify right side
    84.62x = 9,641.76
  5. Step 5: Solve for x
    x = 9,641.76/84.62
  6. Step 6: Final answer
    x = 113.94

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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.