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Finding the Fourth Proportional to 129.74, 195.31 and 118.58

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Solution

The fourth proportional to 129.74, 195.31 and 118.58 is: 178.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.74 : 195.31 = 118.58 : x
  2. Step 2: Convert to fraction form
    129.74/195.31 = 118.58/x
  3. Step 3: Cross multiply
    129.74x = 195.31 × 118.58
  4. Step 4: Simplify right side
    129.74x = 23,158.59
  5. Step 5: Solve for x
    x = 23,158.59/129.74
  6. Step 6: Final answer
    x = 178.51

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.