Home / 81,422.20-122,321.02-78,059.21

Finding the Fourth Proportional to 81,422.20, 122,321.02 and 78,059.21

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Solution

The fourth proportional to 81,422.20, 122,321.02 and 78,059.21 is: 117,268.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,422.20 : 122,321.02 = 78,059.21 : x
  2. Step 2: Convert to fraction form
    81,422.20/122,321.02 = 78,059.21/x
  3. Step 3: Cross multiply
    81,422.20x = 122,321.02 × 78,059.21
  4. Step 4: Simplify right side
    81,422.20x = 9,548,282,298.25
  5. Step 5: Solve for x
    x = 9,548,282,298.25/81,422.20
  6. Step 6: Final answer
    x = 117,268.79

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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.