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Finding the Fourth Proportional to 308.90, 426.10 and 220.30

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Solution

The fourth proportional to 308.90, 426.10 and 220.30 is: 303.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.90 : 426.10 = 220.30 : x
  2. Step 2: Convert to fraction form
    308.90/426.10 = 220.30/x
  3. Step 3: Cross multiply
    308.90x = 426.10 × 220.30
  4. Step 4: Simplify right side
    308.90x = 93,869.83
  5. Step 5: Solve for x
    x = 93,869.83/308.90
  6. Step 6: Final answer
    x = 303.88

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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.