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Finding the Fourth Proportional to 342.33, 512.78 and 220.22

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Solution

The fourth proportional to 342.33, 512.78 and 220.22 is: 329.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.33 : 512.78 = 220.22 : x
  2. Step 2: Convert to fraction form
    342.33/512.78 = 220.22/x
  3. Step 3: Cross multiply
    342.33x = 512.78 × 220.22
  4. Step 4: Simplify right side
    342.33x = 112,920.75
  5. Step 5: Solve for x
    x = 112,920.75/342.33
  6. Step 6: Final answer
    x = 329.86

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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.