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Finding the Fourth Proportional to 8,115.80, 12,173.70 and 2,919.80

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Solution

The fourth proportional to 8,115.80, 12,173.70 and 2,919.80 is: 4,379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115.80 : 12,173.70 = 2,919.80 : x
  2. Step 2: Convert to fraction form
    8,115.80/12,173.70 = 2,919.80/x
  3. Step 3: Cross multiply
    8,115.80x = 12,173.70 × 2,919.80
  4. Step 4: Simplify right side
    8,115.80x = 35,544,769.26
  5. Step 5: Solve for x
    x = 35,544,769.26/8,115.80
  6. Step 6: Final answer
    x = 4,379.70

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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.