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Finding the Fourth Proportional to 127.50, 191.25 and 120.66

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Solution

The fourth proportional to 127.50, 191.25 and 120.66 is: 180.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.50 : 191.25 = 120.66 : x
  2. Step 2: Convert to fraction form
    127.50/191.25 = 120.66/x
  3. Step 3: Cross multiply
    127.50x = 191.25 × 120.66
  4. Step 4: Simplify right side
    127.50x = 23,076.23
  5. Step 5: Solve for x
    x = 23,076.23/127.50
  6. Step 6: Final answer
    x = 180.99

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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.