Home / 20,085.20-30,132.60-8,391.92

Finding the Fourth Proportional to 20,085.20, 30,132.60 and 8,391.92

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Solution

The fourth proportional to 20,085.20, 30,132.60 and 8,391.92 is: 12,589.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,085.20 : 30,132.60 = 8,391.92 : x
  2. Step 2: Convert to fraction form
    20,085.20/30,132.60 = 8,391.92/x
  3. Step 3: Cross multiply
    20,085.20x = 30,132.60 × 8,391.92
  4. Step 4: Simplify right side
    20,085.20x = 252,870,368.59
  5. Step 5: Solve for x
    x = 252,870,368.59/20,085.20
  6. Step 6: Final answer
    x = 12,589.89

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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.