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Finding the Fourth Proportional to 1,226.20, 1,839.20 and 738.92

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Solution

The fourth proportional to 1,226.20, 1,839.20 and 738.92 is: 1,108.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.20 : 1,839.20 = 738.92 : x
  2. Step 2: Convert to fraction form
    1,226.20/1,839.20 = 738.92/x
  3. Step 3: Cross multiply
    1,226.20x = 1,839.20 × 738.92
  4. Step 4: Simplify right side
    1,226.20x = 1,359,021.66
  5. Step 5: Solve for x
    x = 1,359,021.66/1,226.20
  6. Step 6: Final answer
    x = 1,108.32

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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.