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Finding the Fourth Proportional to 72,991.87, 100,711.55 and 44,310.80

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Solution

The fourth proportional to 72,991.87, 100,711.55 and 44,310.80 is: 61,138.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.87 : 100,711.55 = 44,310.80 : x
  2. Step 2: Convert to fraction form
    72,991.87/100,711.55 = 44,310.80/x
  3. Step 3: Cross multiply
    72,991.87x = 100,711.55 × 44,310.80
  4. Step 4: Simplify right side
    72,991.87x = 4,462,609,712.30
  5. Step 5: Solve for x
    x = 4,462,609,712.30/72,991.87
  6. Step 6: Final answer
    x = 61,138.45

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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.