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Finding the Fourth Proportional to 47,991.78, 71,987.00 and 21,678.12

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Solution

The fourth proportional to 47,991.78, 71,987.00 and 21,678.12 is: 32,516.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,991.78 : 71,987.00 = 21,678.12 : x
  2. Step 2: Convert to fraction form
    47,991.78/71,987.00 = 21,678.12/x
  3. Step 3: Cross multiply
    47,991.78x = 71,987.00 × 21,678.12
  4. Step 4: Simplify right side
    47,991.78x = 1,560,542,716.05
  5. Step 5: Solve for x
    x = 1,560,542,716.05/47,991.78
  6. Step 6: Final answer
    x = 32,516.88

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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.