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Finding the Fourth Proportional to 138,608.75, 207,935.55 and 54,323.19

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Solution

The fourth proportional to 138,608.75, 207,935.55 and 54,323.19 is: 81,493.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,608.75 : 207,935.55 = 54,323.19 : x
  2. Step 2: Convert to fraction form
    138,608.75/207,935.55 = 54,323.19/x
  3. Step 3: Cross multiply
    138,608.75x = 207,935.55 × 54,323.19
  4. Step 4: Simplify right side
    138,608.75x = 11,295,722,390.40
  5. Step 5: Solve for x
    x = 11,295,722,390.40/138,608.75
  6. Step 6: Final answer
    x = 81,493.57

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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.