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Finding the Fourth Proportional to 7,940.70, 11,911.05 and 7,211.70

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Solution

The fourth proportional to 7,940.70, 11,911.05 and 7,211.70 is: 10,817.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,940.70 : 11,911.05 = 7,211.70 : x
  2. Step 2: Convert to fraction form
    7,940.70/11,911.05 = 7,211.70/x
  3. Step 3: Cross multiply
    7,940.70x = 11,911.05 × 7,211.70
  4. Step 4: Simplify right side
    7,940.70x = 85,898,919.29
  5. Step 5: Solve for x
    x = 85,898,919.29/7,940.70
  6. Step 6: Final answer
    x = 10,817.55

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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.