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Finding the Fourth Proportional to 220.14, 330.21 and 123.75

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Solution

The fourth proportional to 220.14, 330.21 and 123.75 is: 185.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.14 : 330.21 = 123.75 : x
  2. Step 2: Convert to fraction form
    220.14/330.21 = 123.75/x
  3. Step 3: Cross multiply
    220.14x = 330.21 × 123.75
  4. Step 4: Simplify right side
    220.14x = 40,863.49
  5. Step 5: Solve for x
    x = 40,863.49/220.14
  6. Step 6: Final answer
    x = 185.63

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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.