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Finding the Fourth Proportional to 127.98, 191.04 and 111.78

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Solution

The fourth proportional to 127.98, 191.04 and 111.78 is: 166.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.98 : 191.04 = 111.78 : x
  2. Step 2: Convert to fraction form
    127.98/191.04 = 111.78/x
  3. Step 3: Cross multiply
    127.98x = 191.04 × 111.78
  4. Step 4: Simplify right side
    127.98x = 21,354.45
  5. Step 5: Solve for x
    x = 21,354.45/127.98
  6. Step 6: Final answer
    x = 166.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.