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Finding the Fourth Proportional to 170.78, 235.77 and 121.73

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Solution

The fourth proportional to 170.78, 235.77 and 121.73 is: 168.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.78 : 235.77 = 121.73 : x
  2. Step 2: Convert to fraction form
    170.78/235.77 = 121.73/x
  3. Step 3: Cross multiply
    170.78x = 235.77 × 121.73
  4. Step 4: Simplify right side
    170.78x = 28,700.28
  5. Step 5: Solve for x
    x = 28,700.28/170.78
  6. Step 6: Final answer
    x = 168.05

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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.