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Finding the Fourth Proportional to 170.98, 255.28 and 140.47

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Solution

The fourth proportional to 170.98, 255.28 and 140.47 is: 209.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.98 : 255.28 = 140.47 : x
  2. Step 2: Convert to fraction form
    170.98/255.28 = 140.47/x
  3. Step 3: Cross multiply
    170.98x = 255.28 × 140.47
  4. Step 4: Simplify right side
    170.98x = 35,859.18
  5. Step 5: Solve for x
    x = 35,859.18/170.98
  6. Step 6: Final answer
    x = 209.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.