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Finding the Fourth Proportional to 129.01, 178.03 and 118.55

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Solution

The fourth proportional to 129.01, 178.03 and 118.55 is: 163.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.01 : 178.03 = 118.55 : x
  2. Step 2: Convert to fraction form
    129.01/178.03 = 118.55/x
  3. Step 3: Cross multiply
    129.01x = 178.03 × 118.55
  4. Step 4: Simplify right side
    129.01x = 21,104.38
  5. Step 5: Solve for x
    x = 21,104.38/129.01
  6. Step 6: Final answer
    x = 163.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.