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Finding the Fourth Proportional to 8,721.70, 13,080.72 and 2,876.94

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Solution

The fourth proportional to 8,721.70, 13,080.72 and 2,876.94 is: 4,314.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,721.70 : 13,080.72 = 2,876.94 : x
  2. Step 2: Convert to fraction form
    8,721.70/13,080.72 = 2,876.94/x
  3. Step 3: Cross multiply
    8,721.70x = 13,080.72 × 2,876.94
  4. Step 4: Simplify right side
    8,721.70x = 37,632,446.60
  5. Step 5: Solve for x
    x = 37,632,446.60/8,721.70
  6. Step 6: Final answer
    x = 4,314.81

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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.