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Finding the Fourth Proportional to 220.29, 330.21 and 139.02

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Solution

The fourth proportional to 220.29, 330.21 and 139.02 is: 208.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.29 : 330.21 = 139.02 : x
  2. Step 2: Convert to fraction form
    220.29/330.21 = 139.02/x
  3. Step 3: Cross multiply
    220.29x = 330.21 × 139.02
  4. Step 4: Simplify right side
    220.29x = 45,905.79
  5. Step 5: Solve for x
    x = 45,905.79/220.29
  6. Step 6: Final answer
    x = 208.39

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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.