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Finding the Fourth Proportional to 170.91, 235.75 and 129.39

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Solution

The fourth proportional to 170.91, 235.75 and 129.39 is: 178.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.91 : 235.75 = 129.39 : x
  2. Step 2: Convert to fraction form
    170.91/235.75 = 129.39/x
  3. Step 3: Cross multiply
    170.91x = 235.75 × 129.39
  4. Step 4: Simplify right side
    170.91x = 30,503.69
  5. Step 5: Solve for x
    x = 30,503.69/170.91
  6. Step 6: Final answer
    x = 178.48

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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.