Home / 80,811.20-121,216.80-74,979.20

Finding the Fourth Proportional to 80,811.20, 121,216.80 and 74,979.20

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Solution

The fourth proportional to 80,811.20, 121,216.80 and 74,979.20 is: 112,468.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,811.20 : 121,216.80 = 74,979.20 : x
  2. Step 2: Convert to fraction form
    80,811.20/121,216.80 = 74,979.20/x
  3. Step 3: Cross multiply
    80,811.20x = 121,216.80 × 74,979.20
  4. Step 4: Simplify right side
    80,811.20x = 9,088,738,690.56
  5. Step 5: Solve for x
    x = 9,088,738,690.56/80,811.20
  6. Step 6: Final answer
    x = 112,468.80

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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.