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Finding the Fourth Proportional to 40,361.78, 60,552.39 and 12,659.78

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Solution

The fourth proportional to 40,361.78, 60,552.39 and 12,659.78 is: 18,992.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,361.78 : 60,552.39 = 12,659.78 : x
  2. Step 2: Convert to fraction form
    40,361.78/60,552.39 = 12,659.78/x
  3. Step 3: Cross multiply
    40,361.78x = 60,552.39 × 12,659.78
  4. Step 4: Simplify right side
    40,361.78x = 766,579,935.87
  5. Step 5: Solve for x
    x = 766,579,935.87/40,361.78
  6. Step 6: Final answer
    x = 18,992.72

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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.