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Finding the Fourth Proportional to 7,220.80, 10,820.40 and 6,119.20

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Solution

The fourth proportional to 7,220.80, 10,820.40 and 6,119.20 is: 9,169.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,220.80 : 10,820.40 = 6,119.20 : x
  2. Step 2: Convert to fraction form
    7,220.80/10,820.40 = 6,119.20/x
  3. Step 3: Cross multiply
    7,220.80x = 10,820.40 × 6,119.20
  4. Step 4: Simplify right side
    7,220.80x = 66,212,191.68
  5. Step 5: Solve for x
    x = 66,212,191.68/7,220.80
  6. Step 6: Final answer
    x = 9,169.65

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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.