Home / 20,917.20-28,891.47-15,635.60

Finding the Fourth Proportional to 20,917.20, 28,891.47 and 15,635.60

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Solution

The fourth proportional to 20,917.20, 28,891.47 and 15,635.60 is: 21,596.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.20 : 28,891.47 = 15,635.60 : x
  2. Step 2: Convert to fraction form
    20,917.20/28,891.47 = 15,635.60/x
  3. Step 3: Cross multiply
    20,917.20x = 28,891.47 × 15,635.60
  4. Step 4: Simplify right side
    20,917.20x = 451,735,245.70
  5. Step 5: Solve for x
    x = 451,735,245.70/20,917.20
  6. Step 6: Final answer
    x = 21,596.35

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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.