Home / 8,579.20-12,868.80-7,218.40

Finding the Fourth Proportional to 8,579.20, 12,868.80 and 7,218.40

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Solution

The fourth proportional to 8,579.20, 12,868.80 and 7,218.40 is: 10,827.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,579.20 : 12,868.80 = 7,218.40 : x
  2. Step 2: Convert to fraction form
    8,579.20/12,868.80 = 7,218.40/x
  3. Step 3: Cross multiply
    8,579.20x = 12,868.80 × 7,218.40
  4. Step 4: Simplify right side
    8,579.20x = 92,892,145.92
  5. Step 5: Solve for x
    x = 92,892,145.92/8,579.20
  6. Step 6: Final answer
    x = 10,827.60

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Similar ratio
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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.