Home / 81,409.20-122,142.60-78,529.20

Finding the Fourth Proportional to 81,409.20, 122,142.60 and 78,529.20

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Solution

The fourth proportional to 81,409.20, 122,142.60 and 78,529.20 is: 117,821.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,409.20 : 122,142.60 = 78,529.20 : x
  2. Step 2: Convert to fraction form
    81,409.20/122,142.60 = 78,529.20/x
  3. Step 3: Cross multiply
    81,409.20x = 122,142.60 × 78,529.20
  4. Step 4: Simplify right side
    81,409.20x = 9,591,760,663.92
  5. Step 5: Solve for x
    x = 9,591,760,663.92/81,409.20
  6. Step 6: Final answer
    x = 117,821.58

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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.