Home / 8,279.80-12,429.30-4,382.20

Finding the Fourth Proportional to 8,279.80, 12,429.30 and 4,382.20

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Solution

The fourth proportional to 8,279.80, 12,429.30 and 4,382.20 is: 6,578.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,279.80 : 12,429.30 = 4,382.20 : x
  2. Step 2: Convert to fraction form
    8,279.80/12,429.30 = 4,382.20/x
  3. Step 3: Cross multiply
    8,279.80x = 12,429.30 × 4,382.20
  4. Step 4: Simplify right side
    8,279.80x = 54,467,678.46
  5. Step 5: Solve for x
    x = 54,467,678.46/8,279.80
  6. Step 6: Final answer
    x = 6,578.38

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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.