Home / 81,767.20-122,679.60-78,887.20

Finding the Fourth Proportional to 81,767.20, 122,679.60 and 78,887.20

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Solution

The fourth proportional to 81,767.20, 122,679.60 and 78,887.20 is: 118,358.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,767.20 : 122,679.60 = 78,887.20 : x
  2. Step 2: Convert to fraction form
    81,767.20/122,679.60 = 78,887.20/x
  3. Step 3: Cross multiply
    81,767.20x = 122,679.60 × 78,887.20
  4. Step 4: Simplify right side
    81,767.20x = 9,677,850,141.12
  5. Step 5: Solve for x
    x = 9,677,850,141.12/81,767.20
  6. Step 6: Final answer
    x = 118,358.59

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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.