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Finding the Fourth Proportional to 7,120.80, 10,682.88 and 2,738.40

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Solution

The fourth proportional to 7,120.80, 10,682.88 and 2,738.40 is: 4,108.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.80 : 10,682.88 = 2,738.40 : x
  2. Step 2: Convert to fraction form
    7,120.80/10,682.88 = 2,738.40/x
  3. Step 3: Cross multiply
    7,120.80x = 10,682.88 × 2,738.40
  4. Step 4: Simplify right side
    7,120.80x = 29,253,998.59
  5. Step 5: Solve for x
    x = 29,253,998.59/7,120.80
  6. Step 6: Final answer
    x = 4,108.25

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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.