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Finding the Fourth Proportional to 129.31, 178.38 and 120.04

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Solution

The fourth proportional to 129.31, 178.38 and 120.04 is: 165.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.31 : 178.38 = 120.04 : x
  2. Step 2: Convert to fraction form
    129.31/178.38 = 120.04/x
  3. Step 3: Cross multiply
    129.31x = 178.38 × 120.04
  4. Step 4: Simplify right side
    129.31x = 21,412.74
  5. Step 5: Solve for x
    x = 21,412.74/129.31
  6. Step 6: Final answer
    x = 165.59

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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.