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Finding the Fourth Proportional to 18,914.63, 28,346.43 and 7,221.47

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Solution

The fourth proportional to 18,914.63, 28,346.43 and 7,221.47 is: 10,822.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,914.63 : 28,346.43 = 7,221.47 : x
  2. Step 2: Convert to fraction form
    18,914.63/28,346.43 = 7,221.47/x
  3. Step 3: Cross multiply
    18,914.63x = 28,346.43 × 7,221.47
  4. Step 4: Simplify right side
    18,914.63x = 204,702,786.88
  5. Step 5: Solve for x
    x = 204,702,786.88/18,914.63
  6. Step 6: Final answer
    x = 10,822.46

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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.