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Finding the Fourth Proportional to 88,161.60, 131,858.40 and 78,868.80

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Solution

The fourth proportional to 88,161.60, 131,858.40 and 78,868.80 is: 117,959.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,161.60 : 131,858.40 = 78,868.80 : x
  2. Step 2: Convert to fraction form
    88,161.60/131,858.40 = 78,868.80/x
  3. Step 3: Cross multiply
    88,161.60x = 131,858.40 × 78,868.80
  4. Step 4: Simplify right side
    88,161.60x = 10,399,513,777.92
  5. Step 5: Solve for x
    x = 10,399,513,777.92/88,161.60
  6. Step 6: Final answer
    x = 117,959.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.