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Finding the Fourth Proportional to 81,979.80, 122,969.70 and 67,399.80

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Solution

The fourth proportional to 81,979.80, 122,969.70 and 67,399.80 is: 101,099.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,979.80 : 122,969.70 = 67,399.80 : x
  2. Step 2: Convert to fraction form
    81,979.80/122,969.70 = 67,399.80/x
  3. Step 3: Cross multiply
    81,979.80x = 122,969.70 × 67,399.80
  4. Step 4: Simplify right side
    81,979.80x = 8,288,133,186.06
  5. Step 5: Solve for x
    x = 8,288,133,186.06/81,979.80
  6. Step 6: Final answer
    x = 101,099.70

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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.