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Finding the Fourth Proportional to 40,940.77, 61,421.89 and 12,859.69

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Solution

The fourth proportional to 40,940.77, 61,421.89 and 12,859.69 is: 19,292.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,940.77 : 61,421.89 = 12,859.69 : x
  2. Step 2: Convert to fraction form
    40,940.77/61,421.89 = 12,859.69/x
  3. Step 3: Cross multiply
    40,940.77x = 61,421.89 × 12,859.69
  4. Step 4: Simplify right side
    40,940.77x = 789,866,464.61
  5. Step 5: Solve for x
    x = 789,866,464.61/40,940.77
  6. Step 6: Final answer
    x = 19,292.91

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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.