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Finding the Fourth Proportional to 281.60, 423.20 and 209.76

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Solution

The fourth proportional to 281.60, 423.20 and 209.76 is: 315.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.60 : 423.20 = 209.76 : x
  2. Step 2: Convert to fraction form
    281.60/423.20 = 209.76/x
  3. Step 3: Cross multiply
    281.60x = 423.20 × 209.76
  4. Step 4: Simplify right side
    281.60x = 88,770.43
  5. Step 5: Solve for x
    x = 88,770.43/281.60
  6. Step 6: Final answer
    x = 315.24

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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.