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Finding the Fourth Proportional to 40,647.71, 60,978.17 and 12,561.21

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Solution

The fourth proportional to 40,647.71, 60,978.17 and 12,561.21 is: 18,843.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,647.71 : 60,978.17 = 12,561.21 : x
  2. Step 2: Convert to fraction form
    40,647.71/60,978.17 = 12,561.21/x
  3. Step 3: Cross multiply
    40,647.71x = 60,978.17 × 12,561.21
  4. Step 4: Simplify right side
    40,647.71x = 765,959,535.98
  5. Step 5: Solve for x
    x = 765,959,535.98/40,647.71
  6. Step 6: Final answer
    x = 18,843.85

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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.