Home / 20,987.20-31,447.20-11,113.60

Finding the Fourth Proportional to 20,987.20, 31,447.20 and 11,113.60

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Solution

The fourth proportional to 20,987.20, 31,447.20 and 11,113.60 is: 16,652.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.20 : 31,447.20 = 11,113.60 : x
  2. Step 2: Convert to fraction form
    20,987.20/31,447.20 = 11,113.60/x
  3. Step 3: Cross multiply
    20,987.20x = 31,447.20 × 11,113.60
  4. Step 4: Simplify right side
    20,987.20x = 349,491,601.92
  5. Step 5: Solve for x
    x = 349,491,601.92/20,987.20
  6. Step 6: Final answer
    x = 16,652.61

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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.