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Finding the Fourth Proportional to 127.14, 189.66 and 121.20

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Solution

The fourth proportional to 127.14, 189.66 and 121.20 is: 180.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.14 : 189.66 = 121.20 : x
  2. Step 2: Convert to fraction form
    127.14/189.66 = 121.20/x
  3. Step 3: Cross multiply
    127.14x = 189.66 × 121.20
  4. Step 4: Simplify right side
    127.14x = 22,986.79
  5. Step 5: Solve for x
    x = 22,986.79/127.14
  6. Step 6: Final answer
    x = 180.80

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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.