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Finding the Fourth Proportional to 219.76, 329.80 and 216.76

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Solution

The fourth proportional to 219.76, 329.80 and 216.76 is: 325.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.76 : 329.80 = 216.76 : x
  2. Step 2: Convert to fraction form
    219.76/329.80 = 216.76/x
  3. Step 3: Cross multiply
    219.76x = 329.80 × 216.76
  4. Step 4: Simplify right side
    219.76x = 71,487.45
  5. Step 5: Solve for x
    x = 71,487.45/219.76
  6. Step 6: Final answer
    x = 325.30

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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.