Home / 80,901.20-121,380.60-78,021.20

Finding the Fourth Proportional to 80,901.20, 121,380.60 and 78,021.20

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Solution

The fourth proportional to 80,901.20, 121,380.60 and 78,021.20 is: 117,059.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,901.20 : 121,380.60 = 78,021.20 : x
  2. Step 2: Convert to fraction form
    80,901.20/121,380.60 = 78,021.20/x
  3. Step 3: Cross multiply
    80,901.20x = 121,380.60 × 78,021.20
  4. Step 4: Simplify right side
    80,901.20x = 9,470,260,068.72
  5. Step 5: Solve for x
    x = 9,470,260,068.72/80,901.20
  6. Step 6: Final answer
    x = 117,059.57

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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.