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Finding the Fourth Proportional to 127.11, 189.59 and 118.61

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Solution

The fourth proportional to 127.11, 189.59 and 118.61 is: 176.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.11 : 189.59 = 118.61 : x
  2. Step 2: Convert to fraction form
    127.11/189.59 = 118.61/x
  3. Step 3: Cross multiply
    127.11x = 189.59 × 118.61
  4. Step 4: Simplify right side
    127.11x = 22,487.27
  5. Step 5: Solve for x
    x = 22,487.27/127.11
  6. Step 6: Final answer
    x = 176.91

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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.