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Finding the Fourth Proportional to 7,958.78, 11,938.74 and 2,115.26

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Solution

The fourth proportional to 7,958.78, 11,938.74 and 2,115.26 is: 3,173.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,958.78 : 11,938.74 = 2,115.26 : x
  2. Step 2: Convert to fraction form
    7,958.78/11,938.74 = 2,115.26/x
  3. Step 3: Cross multiply
    7,958.78x = 11,938.74 × 2,115.26
  4. Step 4: Simplify right side
    7,958.78x = 25,253,539.17
  5. Step 5: Solve for x
    x = 25,253,539.17/7,958.78
  6. Step 6: Final answer
    x = 3,173.04

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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.