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Finding the Fourth Proportional to 3,138.80, 4,708.20 and 2,721.20

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Solution

The fourth proportional to 3,138.80, 4,708.20 and 2,721.20 is: 4,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.80 : 4,708.20 = 2,721.20 : x
  2. Step 2: Convert to fraction form
    3,138.80/4,708.20 = 2,721.20/x
  3. Step 3: Cross multiply
    3,138.80x = 4,708.20 × 2,721.20
  4. Step 4: Simplify right side
    3,138.80x = 12,811,953.84
  5. Step 5: Solve for x
    x = 12,811,953.84/3,138.80
  6. Step 6: Final answer
    x = 4,081.80

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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.