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Finding the Fourth Proportional to 170.85, 235.46 and 129.18

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Solution

The fourth proportional to 170.85, 235.46 and 129.18 is: 178.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.85 : 235.46 = 129.18 : x
  2. Step 2: Convert to fraction form
    170.85/235.46 = 129.18/x
  3. Step 3: Cross multiply
    170.85x = 235.46 × 129.18
  4. Step 4: Simplify right side
    170.85x = 30,416.72
  5. Step 5: Solve for x
    x = 30,416.72/170.85
  6. Step 6: Final answer
    x = 178.03

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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.