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Finding the Fourth Proportional to 121.82, 168.01 and 98.50

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Solution

The fourth proportional to 121.82, 168.01 and 98.50 is: 135.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.82 : 168.01 = 98.50 : x
  2. Step 2: Convert to fraction form
    121.82/168.01 = 98.50/x
  3. Step 3: Cross multiply
    121.82x = 168.01 × 98.50
  4. Step 4: Simplify right side
    121.82x = 16,548.99
  5. Step 5: Solve for x
    x = 16,548.99/121.82
  6. Step 6: Final answer
    x = 135.85

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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.