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Finding the Fourth Proportional to 129.15, 177.13 and 122.55

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Solution

The fourth proportional to 129.15, 177.13 and 122.55 is: 168.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.15 : 177.13 = 122.55 : x
  2. Step 2: Convert to fraction form
    129.15/177.13 = 122.55/x
  3. Step 3: Cross multiply
    129.15x = 177.13 × 122.55
  4. Step 4: Simplify right side
    129.15x = 21,707.77
  5. Step 5: Solve for x
    x = 21,707.77/129.15
  6. Step 6: Final answer
    x = 168.08

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.