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Finding the Fourth Proportional to 20,139.80, 30,209.70 and 8,475.80

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Solution

The fourth proportional to 20,139.80, 30,209.70 and 8,475.80 is: 12,713.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.80 : 30,209.70 = 8,475.80 : x
  2. Step 2: Convert to fraction form
    20,139.80/30,209.70 = 8,475.80/x
  3. Step 3: Cross multiply
    20,139.80x = 30,209.70 × 8,475.80
  4. Step 4: Simplify right side
    20,139.80x = 256,051,375.26
  5. Step 5: Solve for x
    x = 256,051,375.26/20,139.80
  6. Step 6: Final answer
    x = 12,713.70

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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.