Home / 20,819.71-31,239.80-9,724.78

Finding the Fourth Proportional to 20,819.71, 31,239.80 and 9,724.78

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Solution

The fourth proportional to 20,819.71, 31,239.80 and 9,724.78 is: 14,591.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.71 : 31,239.80 = 9,724.78 : x
  2. Step 2: Convert to fraction form
    20,819.71/31,239.80 = 9,724.78/x
  3. Step 3: Cross multiply
    20,819.71x = 31,239.80 × 9,724.78
  4. Step 4: Simplify right side
    20,819.71x = 303,800,182.24
  5. Step 5: Solve for x
    x = 303,800,182.24/20,819.71
  6. Step 6: Final answer
    x = 14,591.95

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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.