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Finding the Fourth Proportional to 223.20, 308.88 and 217.80

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Solution

The fourth proportional to 223.20, 308.88 and 217.80 is: 301.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.20 : 308.88 = 217.80 : x
  2. Step 2: Convert to fraction form
    223.20/308.88 = 217.80/x
  3. Step 3: Cross multiply
    223.20x = 308.88 × 217.80
  4. Step 4: Simplify right side
    223.20x = 67,274.06
  5. Step 5: Solve for x
    x = 67,274.06/223.20
  6. Step 6: Final answer
    x = 301.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.