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Finding the Fourth Proportional to 80,704.80, 121,057.20 and 72,928.80

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Solution

The fourth proportional to 80,704.80, 121,057.20 and 72,928.80 is: 109,393.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,704.80 : 121,057.20 = 72,928.80 : x
  2. Step 2: Convert to fraction form
    80,704.80/121,057.20 = 72,928.80/x
  3. Step 3: Cross multiply
    80,704.80x = 121,057.20 × 72,928.80
  4. Step 4: Simplify right side
    80,704.80x = 8,828,556,327.36
  5. Step 5: Solve for x
    x = 8,828,556,327.36/80,704.80
  6. Step 6: Final answer
    x = 109,393.20

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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.