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Finding the Fourth Proportional to 170.13, 234.86 and 128.82

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Solution

The fourth proportional to 170.13, 234.86 and 128.82 is: 177.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.13 : 234.86 = 128.82 : x
  2. Step 2: Convert to fraction form
    170.13/234.86 = 128.82/x
  3. Step 3: Cross multiply
    170.13x = 234.86 × 128.82
  4. Step 4: Simplify right side
    170.13x = 30,254.02
  5. Step 5: Solve for x
    x = 30,254.02/170.13
  6. Step 6: Final answer
    x = 177.83

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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.