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Finding the Fourth Proportional to 170.70, 235.26 and 129.21

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Solution

The fourth proportional to 170.70, 235.26 and 129.21 is: 178.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.70 : 235.26 = 129.21 : x
  2. Step 2: Convert to fraction form
    170.70/235.26 = 129.21/x
  3. Step 3: Cross multiply
    170.70x = 235.26 × 129.21
  4. Step 4: Simplify right side
    170.70x = 30,397.94
  5. Step 5: Solve for x
    x = 30,397.94/170.70
  6. Step 6: Final answer
    x = 178.08

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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.