Home / 8,579.20-12,868.80-7,772.80

Finding the Fourth Proportional to 8,579.20, 12,868.80 and 7,772.80

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Solution

The fourth proportional to 8,579.20, 12,868.80 and 7,772.80 is: 11,659.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,579.20 : 12,868.80 = 7,772.80 : x
  2. Step 2: Convert to fraction form
    8,579.20/12,868.80 = 7,772.80/x
  3. Step 3: Cross multiply
    8,579.20x = 12,868.80 × 7,772.80
  4. Step 4: Simplify right side
    8,579.20x = 100,026,608.64
  5. Step 5: Solve for x
    x = 100,026,608.64/8,579.20
  6. Step 6: Final answer
    x = 11,659.20

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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.