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Finding the Fourth Proportional to 72,687.65, 109,046.12 and 25,939.31

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Solution

The fourth proportional to 72,687.65, 109,046.12 and 25,939.31 is: 38,914.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,687.65 : 109,046.12 = 25,939.31 : x
  2. Step 2: Convert to fraction form
    72,687.65/109,046.12 = 25,939.31/x
  3. Step 3: Cross multiply
    72,687.65x = 109,046.12 × 25,939.31
  4. Step 4: Simplify right side
    72,687.65x = 2,828,580,436.05
  5. Step 5: Solve for x
    x = 2,828,580,436.05/72,687.65
  6. Step 6: Final answer
    x = 38,914.18

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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.