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Finding the Fourth Proportional to 127.85, 191.81 and 41.20

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Solution

The fourth proportional to 127.85, 191.81 and 41.20 is: 61.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.85 : 191.81 = 41.20 : x
  2. Step 2: Convert to fraction form
    127.85/191.81 = 41.20/x
  3. Step 3: Cross multiply
    127.85x = 191.81 × 41.20
  4. Step 4: Simplify right side
    127.85x = 7,901.89
  5. Step 5: Solve for x
    x = 7,901.89/127.85
  6. Step 6: Final answer
    x = 61.80

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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.