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Finding the Fourth Proportional to 72,639.87, 108,959.81 and 25,859.94

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Solution

The fourth proportional to 72,639.87, 108,959.81 and 25,859.94 is: 38,789.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,639.87 : 108,959.81 = 25,859.94 : x
  2. Step 2: Convert to fraction form
    72,639.87/108,959.81 = 25,859.94/x
  3. Step 3: Cross multiply
    72,639.87x = 108,959.81 × 25,859.94
  4. Step 4: Simplify right side
    72,639.87x = 2,817,694,149.01
  5. Step 5: Solve for x
    x = 2,817,694,149.01/72,639.87
  6. Step 6: Final answer
    x = 38,789.91

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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.