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Finding the Fourth Proportional to 48,979.40, 73,469.10 and 21,331.40

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Solution

The fourth proportional to 48,979.40, 73,469.10 and 21,331.40 is: 31,997.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,979.40 : 73,469.10 = 21,331.40 : x
  2. Step 2: Convert to fraction form
    48,979.40/73,469.10 = 21,331.40/x
  3. Step 3: Cross multiply
    48,979.40x = 73,469.10 × 21,331.40
  4. Step 4: Simplify right side
    48,979.40x = 1,567,198,759.74
  5. Step 5: Solve for x
    x = 1,567,198,759.74/48,979.40
  6. Step 6: Final answer
    x = 31,997.10

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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.