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Finding the Fourth Proportional to 31,685.92, 43,724.88 and 18,939.40

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Solution

The fourth proportional to 31,685.92, 43,724.88 and 18,939.40 is: 26,135.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,685.92 : 43,724.88 = 18,939.40 : x
  2. Step 2: Convert to fraction form
    31,685.92/43,724.88 = 18,939.40/x
  3. Step 3: Cross multiply
    31,685.92x = 43,724.88 × 18,939.40
  4. Step 4: Simplify right side
    31,685.92x = 828,122,992.27
  5. Step 5: Solve for x
    x = 828,122,992.27/31,685.92
  6. Step 6: Final answer
    x = 26,135.36

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.