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Finding the Fourth Proportional to 6,808.20, 10,209.90 and 3,112.20

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Solution

The fourth proportional to 6,808.20, 10,209.90 and 3,112.20 is: 4,667.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,808.20 : 10,209.90 = 3,112.20 : x
  2. Step 2: Convert to fraction form
    6,808.20/10,209.90 = 3,112.20/x
  3. Step 3: Cross multiply
    6,808.20x = 10,209.90 × 3,112.20
  4. Step 4: Simplify right side
    6,808.20x = 31,775,250.78
  5. Step 5: Solve for x
    x = 31,775,250.78/6,808.20
  6. Step 6: Final answer
    x = 4,667.20

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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.