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Finding the Fourth Proportional to 21,249.80, 31,843.70 and 18,914.50

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Solution

The fourth proportional to 21,249.80, 31,843.70 and 18,914.50 is: 28,344.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,249.80 : 31,843.70 = 18,914.50 : x
  2. Step 2: Convert to fraction form
    21,249.80/31,843.70 = 18,914.50/x
  3. Step 3: Cross multiply
    21,249.80x = 31,843.70 × 18,914.50
  4. Step 4: Simplify right side
    21,249.80x = 602,307,663.65
  5. Step 5: Solve for x
    x = 602,307,663.65/21,249.80
  6. Step 6: Final answer
    x = 28,344.16

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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.