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Finding the Fourth Proportional to 1,273.44, 1,909.92 and 726.24

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Solution

The fourth proportional to 1,273.44, 1,909.92 and 726.24 is: 1,089.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.44 : 1,909.92 = 726.24 : x
  2. Step 2: Convert to fraction form
    1,273.44/1,909.92 = 726.24/x
  3. Step 3: Cross multiply
    1,273.44x = 1,909.92 × 726.24
  4. Step 4: Simplify right side
    1,273.44x = 1,387,060.30
  5. Step 5: Solve for x
    x = 1,387,060.30/1,273.44
  6. Step 6: Final answer
    x = 1,089.22

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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.