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Finding the Fourth Proportional to 78,871.76, 108,855.53 and 50,161.49

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Solution

The fourth proportional to 78,871.76, 108,855.53 and 50,161.49 is: 69,230.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,871.76 : 108,855.53 = 50,161.49 : x
  2. Step 2: Convert to fraction form
    78,871.76/108,855.53 = 50,161.49/x
  3. Step 3: Cross multiply
    78,871.76x = 108,855.53 × 50,161.49
  4. Step 4: Simplify right side
    78,871.76x = 5,460,355,579.54
  5. Step 5: Solve for x
    x = 5,460,355,579.54/78,871.76
  6. Step 6: Final answer
    x = 69,230.81

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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.