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Finding the Fourth Proportional to 220.40, 330.60 and 139.13

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Solution

The fourth proportional to 220.40, 330.60 and 139.13 is: 208.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.40 : 330.60 = 139.13 : x
  2. Step 2: Convert to fraction form
    220.40/330.60 = 139.13/x
  3. Step 3: Cross multiply
    220.40x = 330.60 × 139.13
  4. Step 4: Simplify right side
    220.40x = 45,996.38
  5. Step 5: Solve for x
    x = 45,996.38/220.40
  6. Step 6: Final answer
    x = 208.70

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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.