Home / 8,230.20-12,345.30-7,279.80

Finding the Fourth Proportional to 8,230.20, 12,345.30 and 7,279.80

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Solution

The fourth proportional to 8,230.20, 12,345.30 and 7,279.80 is: 10,919.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,230.20 : 12,345.30 = 7,279.80 : x
  2. Step 2: Convert to fraction form
    8,230.20/12,345.30 = 7,279.80/x
  3. Step 3: Cross multiply
    8,230.20x = 12,345.30 × 7,279.80
  4. Step 4: Simplify right side
    8,230.20x = 89,871,314.94
  5. Step 5: Solve for x
    x = 89,871,314.94/8,230.20
  6. Step 6: Final answer
    x = 10,919.70

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Double scale
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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.