Home / 8,391.20-12,572.40-3,999.20

Finding the Fourth Proportional to 8,391.20, 12,572.40 and 3,999.20

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Solution

The fourth proportional to 8,391.20, 12,572.40 and 3,999.20 is: 5,991.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.20 : 12,572.40 = 3,999.20 : x
  2. Step 2: Convert to fraction form
    8,391.20/12,572.40 = 3,999.20/x
  3. Step 3: Cross multiply
    8,391.20x = 12,572.40 × 3,999.20
  4. Step 4: Simplify right side
    8,391.20x = 50,279,542.08
  5. Step 5: Solve for x
    x = 50,279,542.08/8,391.20
  6. Step 6: Final answer
    x = 5,991.94

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1.5x scale

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.