Home / 8,319.20-12,479.40-2,619.68

Finding the Fourth Proportional to 8,319.20, 12,479.40 and 2,619.68

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Solution

The fourth proportional to 8,319.20, 12,479.40 and 2,619.68 is: 3,929.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,319.20 : 12,479.40 = 2,619.68 : x
  2. Step 2: Convert to fraction form
    8,319.20/12,479.40 = 2,619.68/x
  3. Step 3: Cross multiply
    8,319.20x = 12,479.40 × 2,619.68
  4. Step 4: Simplify right side
    8,319.20x = 32,691,972.20
  5. Step 5: Solve for x
    x = 32,691,972.20/8,319.20
  6. Step 6: Final answer
    x = 3,929.70

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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.