Home / 15,217.92-20,920.20-13,085.60

Finding the Fourth Proportional to 15,217.92, 20,920.20 and 13,085.60

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Solution

The fourth proportional to 15,217.92, 20,920.20 and 13,085.60 is: 17,988.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,217.92 : 20,920.20 = 13,085.60 : x
  2. Step 2: Convert to fraction form
    15,217.92/20,920.20 = 13,085.60/x
  3. Step 3: Cross multiply
    15,217.92x = 20,920.20 × 13,085.60
  4. Step 4: Simplify right side
    15,217.92x = 273,753,369.12
  5. Step 5: Solve for x
    x = 273,753,369.12/15,217.92
  6. Step 6: Final answer
    x = 17,988.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.