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Finding the Fourth Proportional to 71,981.87, 99,335.34 and 39,716.87

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Solution

The fourth proportional to 71,981.87, 99,335.34 and 39,716.87 is: 54,809.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,981.87 : 99,335.34 = 39,716.87 : x
  2. Step 2: Convert to fraction form
    71,981.87/99,335.34 = 39,716.87/x
  3. Step 3: Cross multiply
    71,981.87x = 99,335.34 × 39,716.87
  4. Step 4: Simplify right side
    71,981.87x = 3,945,288,288.51
  5. Step 5: Solve for x
    x = 3,945,288,288.51/71,981.87
  6. Step 6: Final answer
    x = 54,809.48

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Why These Related Problems?

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