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Finding the Fourth Proportional to 226.87, 340.31 and 72.80

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Solution

The fourth proportional to 226.87, 340.31 and 72.80 is: 109.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.87 : 340.31 = 72.80 : x
  2. Step 2: Convert to fraction form
    226.87/340.31 = 72.80/x
  3. Step 3: Cross multiply
    226.87x = 340.31 × 72.80
  4. Step 4: Simplify right side
    226.87x = 24,772.78
  5. Step 5: Solve for x
    x = 24,772.78/226.87
  6. Step 6: Final answer
    x = 109.19

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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.