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Finding the Fourth Proportional to 71,991.58, 99,342.90 and 39,727.49

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Solution

The fourth proportional to 71,991.58, 99,342.90 and 39,727.49 is: 54,820.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,991.58 : 99,342.90 = 39,727.49 : x
  2. Step 2: Convert to fraction form
    71,991.58/99,342.90 = 39,727.49/x
  3. Step 3: Cross multiply
    71,991.58x = 99,342.90 × 39,727.49
  4. Step 4: Simplify right side
    71,991.58x = 3,946,643,569.61
  5. Step 5: Solve for x
    x = 3,946,643,569.61/71,991.58
  6. Step 6: Final answer
    x = 54,820.91

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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.