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Finding the Fourth Proportional to 7,212.80, 10,819.02 and 1,947.80

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Solution

The fourth proportional to 7,212.80, 10,819.02 and 1,947.80 is: 2,921.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,212.80 : 10,819.02 = 1,947.80 : x
  2. Step 2: Convert to fraction form
    7,212.80/10,819.02 = 1,947.80/x
  3. Step 3: Cross multiply
    7,212.80x = 10,819.02 × 1,947.80
  4. Step 4: Simplify right side
    7,212.80x = 21,073,287.16
  5. Step 5: Solve for x
    x = 21,073,287.16/7,212.80
  6. Step 6: Final answer
    x = 2,921.65

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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.