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Finding the Fourth Proportional to 169.78, 234.42 and 130.90

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Solution

The fourth proportional to 169.78, 234.42 and 130.90 is: 180.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.78 : 234.42 = 130.90 : x
  2. Step 2: Convert to fraction form
    169.78/234.42 = 130.90/x
  3. Step 3: Cross multiply
    169.78x = 234.42 × 130.90
  4. Step 4: Simplify right side
    169.78x = 30,685.58
  5. Step 5: Solve for x
    x = 30,685.58/169.78
  6. Step 6: Final answer
    x = 180.74

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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.