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Finding the Fourth Proportional to 71,992.11, 99,348.84 and 40,161

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Solution

The fourth proportional to 71,992.11, 99,348.84 and 40,161 is: 55,422.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,992.11 : 99,348.84 = 40,161 : x
  2. Step 2: Convert to fraction form
    71,992.11/99,348.84 = 40,161/x
  3. Step 3: Cross multiply
    71,992.11x = 99,348.84 × 40,161
  4. Step 4: Simplify right side
    71,992.11x = 3,989,948,763.24
  5. Step 5: Solve for x
    x = 3,989,948,763.24/71,992.11
  6. Step 6: Final answer
    x = 55,422.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.