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Finding the Fourth Proportional to 7,680.80, 11,489.20 and 6,906.40

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Solution

The fourth proportional to 7,680.80, 11,489.20 and 6,906.40 is: 10,330.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,680.80 : 11,489.20 = 6,906.40 : x
  2. Step 2: Convert to fraction form
    7,680.80/11,489.20 = 6,906.40/x
  3. Step 3: Cross multiply
    7,680.80x = 11,489.20 × 6,906.40
  4. Step 4: Simplify right side
    7,680.80x = 79,349,010.88
  5. Step 5: Solve for x
    x = 79,349,010.88/7,680.80
  6. Step 6: Final answer
    x = 10,330.83

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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.