Home / 8,621.40-12,906.90-6,439.80

Finding the Fourth Proportional to 8,621.40, 12,906.90 and 6,439.80

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Solution

The fourth proportional to 8,621.40, 12,906.90 and 6,439.80 is: 9,640.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,621.40 : 12,906.90 = 6,439.80 : x
  2. Step 2: Convert to fraction form
    8,621.40/12,906.90 = 6,439.80/x
  3. Step 3: Cross multiply
    8,621.40x = 12,906.90 × 6,439.80
  4. Step 4: Simplify right side
    8,621.40x = 83,117,854.62
  5. Step 5: Solve for x
    x = 83,117,854.62/8,621.40
  6. Step 6: Final answer
    x = 9,640.88

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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.