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Finding the Fourth Proportional to 169.84, 234.26 and 138.78

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Solution

The fourth proportional to 169.84, 234.26 and 138.78 is: 191.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.84 : 234.26 = 138.78 : x
  2. Step 2: Convert to fraction form
    169.84/234.26 = 138.78/x
  3. Step 3: Cross multiply
    169.84x = 234.26 × 138.78
  4. Step 4: Simplify right side
    169.84x = 32,510.60
  5. Step 5: Solve for x
    x = 32,510.60/169.84
  6. Step 6: Final answer
    x = 191.42

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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.