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Finding the Fourth Proportional to 220.19, 330.39 and 98.49

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Solution

The fourth proportional to 220.19, 330.39 and 98.49 is: 147.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.19 : 330.39 = 98.49 : x
  2. Step 2: Convert to fraction form
    220.19/330.39 = 98.49/x
  3. Step 3: Cross multiply
    220.19x = 330.39 × 98.49
  4. Step 4: Simplify right side
    220.19x = 32,539.62
  5. Step 5: Solve for x
    x = 32,539.62/220.19
  6. Step 6: Final answer
    x = 147.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.