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Finding the Fourth Proportional to 81,409.70, 122,114.55 and 65,857.70

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Solution

The fourth proportional to 81,409.70, 122,114.55 and 65,857.70 is: 98,786.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,409.70 : 122,114.55 = 65,857.70 : x
  2. Step 2: Convert to fraction form
    81,409.70/122,114.55 = 65,857.70/x
  3. Step 3: Cross multiply
    81,409.70x = 122,114.55 × 65,857.70
  4. Step 4: Simplify right side
    81,409.70x = 8,042,183,399.54
  5. Step 5: Solve for x
    x = 8,042,183,399.54/81,409.70
  6. Step 6: Final answer
    x = 98,786.55

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1.5x scale

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.