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Finding the Fourth Proportional to 2,721.79, 4,083.09 and 872.74

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Solution

The fourth proportional to 2,721.79, 4,083.09 and 872.74 is: 1,309.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,721.79 : 4,083.09 = 872.74 : x
  2. Step 2: Convert to fraction form
    2,721.79/4,083.09 = 872.74/x
  3. Step 3: Cross multiply
    2,721.79x = 4,083.09 × 872.74
  4. Step 4: Simplify right side
    2,721.79x = 3,563,475.97
  5. Step 5: Solve for x
    x = 3,563,475.97/2,721.79
  6. Step 6: Final answer
    x = 1,309.24

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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.