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Finding the Fourth Proportional to 7,940.20, 11,927.90 and 6,644.20

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Solution

The fourth proportional to 7,940.20, 11,927.90 and 6,644.20 is: 9,981.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,940.20 : 11,927.90 = 6,644.20 : x
  2. Step 2: Convert to fraction form
    7,940.20/11,927.90 = 6,644.20/x
  3. Step 3: Cross multiply
    7,940.20x = 11,927.90 × 6,644.20
  4. Step 4: Simplify right side
    7,940.20x = 79,251,353.18
  5. Step 5: Solve for x
    x = 79,251,353.18/7,940.20
  6. Step 6: Final answer
    x = 9,981.03

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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.