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Finding the Fourth Proportional to 7,819.09, 10,793.84 and 4,990.21

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Solution

The fourth proportional to 7,819.09, 10,793.84 and 4,990.21 is: 6,888.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,819.09 : 10,793.84 = 4,990.21 : x
  2. Step 2: Convert to fraction form
    7,819.09/10,793.84 = 4,990.21/x
  3. Step 3: Cross multiply
    7,819.09x = 10,793.84 × 4,990.21
  4. Step 4: Simplify right side
    7,819.09x = 53,863,476.37
  5. Step 5: Solve for x
    x = 53,863,476.37/7,819.09
  6. Step 6: Final answer
    x = 6,888.72

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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.