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Finding the Fourth Proportional to 68,939.98, 103,412.09 and 21,556.80

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Solution

The fourth proportional to 68,939.98, 103,412.09 and 21,556.80 is: 32,335.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,939.98 : 103,412.09 = 21,556.80 : x
  2. Step 2: Convert to fraction form
    68,939.98/103,412.09 = 21,556.80/x
  3. Step 3: Cross multiply
    68,939.98x = 103,412.09 × 21,556.80
  4. Step 4: Simplify right side
    68,939.98x = 2,229,233,795.60
  5. Step 5: Solve for x
    x = 2,229,233,795.60/68,939.98
  6. Step 6: Final answer
    x = 32,335.86

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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.