Home / 81,390.40-122,273.21-78,027.46

Finding the Fourth Proportional to 81,390.40, 122,273.21 and 78,027.46

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Solution

The fourth proportional to 81,390.40, 122,273.21 and 78,027.46 is: 117,221.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.40 : 122,273.21 = 78,027.46 : x
  2. Step 2: Convert to fraction form
    81,390.40/122,273.21 = 78,027.46/x
  3. Step 3: Cross multiply
    81,390.40x = 122,273.21 × 78,027.46
  4. Step 4: Simplify right side
    81,390.40x = 9,540,667,891.73
  5. Step 5: Solve for x
    x = 9,540,667,891.73/81,390.40
  6. Step 6: Final answer
    x = 117,221.05

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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.