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Finding the Fourth Proportional to 127.74, 191.64 and 126.12

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Solution

The fourth proportional to 127.74, 191.64 and 126.12 is: 189.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.74 : 191.64 = 126.12 : x
  2. Step 2: Convert to fraction form
    127.74/191.64 = 126.12/x
  3. Step 3: Cross multiply
    127.74x = 191.64 × 126.12
  4. Step 4: Simplify right side
    127.74x = 24,169.64
  5. Step 5: Solve for x
    x = 24,169.64/127.74
  6. Step 6: Final answer
    x = 189.21

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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.