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Finding the Fourth Proportional to 170.15, 234.60 and 128.57

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Solution

The fourth proportional to 170.15, 234.60 and 128.57 is: 177.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.15 : 234.60 = 128.57 : x
  2. Step 2: Convert to fraction form
    170.15/234.60 = 128.57/x
  3. Step 3: Cross multiply
    170.15x = 234.60 × 128.57
  4. Step 4: Simplify right side
    170.15x = 30,162.52
  5. Step 5: Solve for x
    x = 30,162.52/170.15
  6. Step 6: Final answer
    x = 177.27

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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.