Home / 20,091.40-30,147.90-8,405.80

Finding the Fourth Proportional to 20,091.40, 30,147.90 and 8,405.80

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Solution

The fourth proportional to 20,091.40, 30,147.90 and 8,405.80 is: 12,613.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,091.40 : 30,147.90 = 8,405.80 : x
  2. Step 2: Convert to fraction form
    20,091.40/30,147.90 = 8,405.80/x
  3. Step 3: Cross multiply
    20,091.40x = 30,147.90 × 8,405.80
  4. Step 4: Simplify right side
    20,091.40x = 253,417,217.82
  5. Step 5: Solve for x
    x = 253,417,217.82/20,091.40
  6. Step 6: Final answer
    x = 12,613.22

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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.