Home / 8,479.50-12,718.40-5,190.90

Finding the Fourth Proportional to 8,479.50, 12,718.40 and 5,190.90

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Solution

The fourth proportional to 8,479.50, 12,718.40 and 5,190.90 is: 7,785.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,479.50 : 12,718.40 = 5,190.90 : x
  2. Step 2: Convert to fraction form
    8,479.50/12,718.40 = 5,190.90/x
  3. Step 3: Cross multiply
    8,479.50x = 12,718.40 × 5,190.90
  4. Step 4: Simplify right side
    8,479.50x = 66,019,942.56
  5. Step 5: Solve for x
    x = 66,019,942.56/8,479.50
  6. Step 6: Final answer
    x = 7,785.83

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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.