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Finding the Fourth Proportional to 170.45, 234.80 and 121.25

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Solution

The fourth proportional to 170.45, 234.80 and 121.25 is: 167.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.45 : 234.80 = 121.25 : x
  2. Step 2: Convert to fraction form
    170.45/234.80 = 121.25/x
  3. Step 3: Cross multiply
    170.45x = 234.80 × 121.25
  4. Step 4: Simplify right side
    170.45x = 28,468.61
  5. Step 5: Solve for x
    x = 28,468.61/170.45
  6. Step 6: Final answer
    x = 167.02

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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.