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Finding the Fourth Proportional to 1,478.65, 2,217.97 and 748.43

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Solution

The fourth proportional to 1,478.65, 2,217.97 and 748.43 is: 1,122.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.65 : 2,217.97 = 748.43 : x
  2. Step 2: Convert to fraction form
    1,478.65/2,217.97 = 748.43/x
  3. Step 3: Cross multiply
    1,478.65x = 2,217.97 × 748.43
  4. Step 4: Simplify right side
    1,478.65x = 1,659,991.54
  5. Step 5: Solve for x
    x = 1,659,991.54/1,478.65
  6. Step 6: Final answer
    x = 1,122.64

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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.