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Finding the Fourth Proportional to 220.51, 330.05 and 138.95

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Solution

The fourth proportional to 220.51, 330.05 and 138.95 is: 207.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.51 : 330.05 = 138.95 : x
  2. Step 2: Convert to fraction form
    220.51/330.05 = 138.95/x
  3. Step 3: Cross multiply
    220.51x = 330.05 × 138.95
  4. Step 4: Simplify right side
    220.51x = 45,860.45
  5. Step 5: Solve for x
    x = 45,860.45/220.51
  6. Step 6: Final answer
    x = 207.97

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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.