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Finding the Fourth Proportional to 7,278.80, 10,920.23 and 3,120.80

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Solution

The fourth proportional to 7,278.80, 10,920.23 and 3,120.80 is: 4,682.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,278.80 : 10,920.23 = 3,120.80 : x
  2. Step 2: Convert to fraction form
    7,278.80/10,920.23 = 3,120.80/x
  3. Step 3: Cross multiply
    7,278.80x = 10,920.23 × 3,120.80
  4. Step 4: Simplify right side
    7,278.80x = 34,079,853.78
  5. Step 5: Solve for x
    x = 34,079,853.78/7,278.80
  6. Step 6: Final answer
    x = 4,682.07

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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.