Home / 20,515.20-28,314.90-12,019.20

Finding the Fourth Proportional to 20,515.20, 28,314.90 and 12,019.20

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Solution

The fourth proportional to 20,515.20, 28,314.90 and 12,019.20 is: 16,588.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.20 : 28,314.90 = 12,019.20 : x
  2. Step 2: Convert to fraction form
    20,515.20/28,314.90 = 12,019.20/x
  3. Step 3: Cross multiply
    20,515.20x = 28,314.90 × 12,019.20
  4. Step 4: Simplify right side
    20,515.20x = 340,322,446.08
  5. Step 5: Solve for x
    x = 340,322,446.08/20,515.20
  6. Step 6: Final answer
    x = 16,588.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.