Home / 20,983.20-31,441.20-11,109.60

Finding the Fourth Proportional to 20,983.20, 31,441.20 and 11,109.60

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Solution

The fourth proportional to 20,983.20, 31,441.20 and 11,109.60 is: 16,646.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,983.20 : 31,441.20 = 11,109.60 : x
  2. Step 2: Convert to fraction form
    20,983.20/31,441.20 = 11,109.60/x
  3. Step 3: Cross multiply
    20,983.20x = 31,441.20 × 11,109.60
  4. Step 4: Simplify right side
    20,983.20x = 349,299,155.52
  5. Step 5: Solve for x
    x = 349,299,155.52/20,983.20
  6. Step 6: Final answer
    x = 16,646.61

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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.