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Finding the Fourth Proportional to 79,728.76, 110,021.61 and 43,918

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Solution

The fourth proportional to 79,728.76, 110,021.61 and 43,918 is: 60,604.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,728.76 : 110,021.61 = 43,918 : x
  2. Step 2: Convert to fraction form
    79,728.76/110,021.61 = 43,918/x
  3. Step 3: Cross multiply
    79,728.76x = 110,021.61 × 43,918
  4. Step 4: Simplify right side
    79,728.76x = 4,831,929,067.98
  5. Step 5: Solve for x
    x = 4,831,929,067.98/79,728.76
  6. Step 6: Final answer
    x = 60,604.59

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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.