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Finding the Fourth Proportional to 72,138.35, 108,219.15 and 22,218.43

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Solution

The fourth proportional to 72,138.35, 108,219.15 and 22,218.43 is: 33,331.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,138.35 : 108,219.15 = 22,218.43 : x
  2. Step 2: Convert to fraction form
    72,138.35/108,219.15 = 22,218.43/x
  3. Step 3: Cross multiply
    72,138.35x = 108,219.15 × 22,218.43
  4. Step 4: Simplify right side
    72,138.35x = 2,404,459,608.93
  5. Step 5: Solve for x
    x = 2,404,459,608.93/72,138.35
  6. Step 6: Final answer
    x = 33,331.23

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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.