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Finding the Fourth Proportional to 49,218.80, 73,837.80 and 21,138.80

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Solution

The fourth proportional to 49,218.80, 73,837.80 and 21,138.80 is: 31,712.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    49,218.80 : 73,837.80 = 21,138.80 : x
  2. Step 2: Convert to fraction form
    49,218.80/73,837.80 = 21,138.80/x
  3. Step 3: Cross multiply
    49,218.80x = 73,837.80 × 21,138.80
  4. Step 4: Simplify right side
    49,218.80x = 1,560,842,486.64
  5. Step 5: Solve for x
    x = 1,560,842,486.64/49,218.80
  6. Step 6: Final answer
    x = 31,712.32

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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.