Home / 8,109.20-12,162.90-6,645.80

Finding the Fourth Proportional to 8,109.20, 12,162.90 and 6,645.80

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Solution

The fourth proportional to 8,109.20, 12,162.90 and 6,645.80 is: 9,967.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,109.20 : 12,162.90 = 6,645.80 : x
  2. Step 2: Convert to fraction form
    8,109.20/12,162.90 = 6,645.80/x
  3. Step 3: Cross multiply
    8,109.20x = 12,162.90 × 6,645.80
  4. Step 4: Simplify right side
    8,109.20x = 80,832,200.82
  5. Step 5: Solve for x
    x = 80,832,200.82/8,109.20
  6. Step 6: Final answer
    x = 9,967.96

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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.