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Finding the Fourth Proportional to 82,426.80, 123,899.40 and 80,871.60

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Solution

The fourth proportional to 82,426.80, 123,899.40 and 80,871.60 is: 121,561.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,426.80 : 123,899.40 = 80,871.60 : x
  2. Step 2: Convert to fraction form
    82,426.80/123,899.40 = 80,871.60/x
  3. Step 3: Cross multiply
    82,426.80x = 123,899.40 × 80,871.60
  4. Step 4: Simplify right side
    82,426.80x = 10,019,942,717.04
  5. Step 5: Solve for x
    x = 10,019,942,717.04/82,426.80
  6. Step 6: Final answer
    x = 121,561.71

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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.