Home / 8,515.20-12,771.84-3,319.68

Finding the Fourth Proportional to 8,515.20, 12,771.84 and 3,319.68

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Solution

The fourth proportional to 8,515.20, 12,771.84 and 3,319.68 is: 4,979.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,515.20 : 12,771.84 = 3,319.68 : x
  2. Step 2: Convert to fraction form
    8,515.20/12,771.84 = 3,319.68/x
  3. Step 3: Cross multiply
    8,515.20x = 12,771.84 × 3,319.68
  4. Step 4: Simplify right side
    8,515.20x = 42,398,421.81
  5. Step 5: Solve for x
    x = 42,398,421.81/8,515.20
  6. Step 6: Final answer
    x = 4,979.15

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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.