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Finding the Fourth Proportional to 121.60, 167.55 and 98.20

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Solution

The fourth proportional to 121.60, 167.55 and 98.20 is: 135.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.60 : 167.55 = 98.20 : x
  2. Step 2: Convert to fraction form
    121.60/167.55 = 98.20/x
  3. Step 3: Cross multiply
    121.60x = 167.55 × 98.20
  4. Step 4: Simplify right side
    121.60x = 16,453.41
  5. Step 5: Solve for x
    x = 16,453.41/121.60
  6. Step 6: Final answer
    x = 135.31

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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.