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Finding the Fourth Proportional to 72,991.44, 100,785.20 and 57,121.11

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Solution

The fourth proportional to 72,991.44, 100,785.20 and 57,121.11 is: 78,871.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.44 : 100,785.20 = 57,121.11 : x
  2. Step 2: Convert to fraction form
    72,991.44/100,785.20 = 57,121.11/x
  3. Step 3: Cross multiply
    72,991.44x = 100,785.20 × 57,121.11
  4. Step 4: Simplify right side
    72,991.44x = 5,756,962,209.97
  5. Step 5: Solve for x
    x = 5,756,962,209.97/72,991.44
  6. Step 6: Final answer
    x = 78,871.74

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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.