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Finding the Fourth Proportional to 18,662.68, 28,003.74 and 8,272

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Solution

The fourth proportional to 18,662.68, 28,003.74 and 8,272 is: 12,412.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,662.68 : 28,003.74 = 8,272 : x
  2. Step 2: Convert to fraction form
    18,662.68/28,003.74 = 8,272/x
  3. Step 3: Cross multiply
    18,662.68x = 28,003.74 × 8,272
  4. Step 4: Simplify right side
    18,662.68x = 231,646,937.28
  5. Step 5: Solve for x
    x = 231,646,937.28/18,662.68
  6. Step 6: Final answer
    x = 12,412.31

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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.