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Finding the Fourth Proportional to 40,648.94, 60,979.28 and 12,571.31

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Solution

The fourth proportional to 40,648.94, 60,979.28 and 12,571.31 is: 18,858.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,648.94 : 60,979.28 = 12,571.31 : x
  2. Step 2: Convert to fraction form
    40,648.94/60,979.28 = 12,571.31/x
  3. Step 3: Cross multiply
    40,648.94x = 60,979.28 × 12,571.31
  4. Step 4: Simplify right side
    40,648.94x = 766,589,064.70
  5. Step 5: Solve for x
    x = 766,589,064.70/40,648.94
  6. Step 6: Final answer
    x = 18,858.77

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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.