Home / 20,139.20-30,213.68-8,445.92

Finding the Fourth Proportional to 20,139.20, 30,213.68 and 8,445.92

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Solution

The fourth proportional to 20,139.20, 30,213.68 and 8,445.92 is: 12,670.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.20 : 30,213.68 = 8,445.92 : x
  2. Step 2: Convert to fraction form
    20,139.20/30,213.68 = 8,445.92/x
  3. Step 3: Cross multiply
    20,139.20x = 30,213.68 × 8,445.92
  4. Step 4: Simplify right side
    20,139.20x = 255,182,324.19
  5. Step 5: Solve for x
    x = 255,182,324.19/20,139.20
  6. Step 6: Final answer
    x = 12,670.93

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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.