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Finding the Fourth Proportional to 169.88, 234.35 and 128.36

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Solution

The fourth proportional to 169.88, 234.35 and 128.36 is: 177.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.88 : 234.35 = 128.36 : x
  2. Step 2: Convert to fraction form
    169.88/234.35 = 128.36/x
  3. Step 3: Cross multiply
    169.88x = 234.35 × 128.36
  4. Step 4: Simplify right side
    169.88x = 30,081.56
  5. Step 5: Solve for x
    x = 30,081.56/169.88
  6. Step 6: Final answer
    x = 177.07

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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.