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Finding the Fourth Proportional to 170.72, 235.92 and 129.40

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Solution

The fourth proportional to 170.72, 235.92 and 129.40 is: 178.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.72 : 235.92 = 129.40 : x
  2. Step 2: Convert to fraction form
    170.72/235.92 = 129.40/x
  3. Step 3: Cross multiply
    170.72x = 235.92 × 129.40
  4. Step 4: Simplify right side
    170.72x = 30,528.05
  5. Step 5: Solve for x
    x = 30,528.05/170.72
  6. Step 6: Final answer
    x = 178.82

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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.