Home / 4,781.80-7,172.70-3,139.30

Finding the Fourth Proportional to 4,781.80, 7,172.70 and 3,139.30

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Solution

The fourth proportional to 4,781.80, 7,172.70 and 3,139.30 is: 4,708.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,781.80 : 7,172.70 = 3,139.30 : x
  2. Step 2: Convert to fraction form
    4,781.80/7,172.70 = 3,139.30/x
  3. Step 3: Cross multiply
    4,781.80x = 7,172.70 × 3,139.30
  4. Step 4: Simplify right side
    4,781.80x = 22,517,257.11
  5. Step 5: Solve for x
    x = 22,517,257.11/4,781.80
  6. Step 6: Final answer
    x = 4,708.95

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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.