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Finding the Fourth Proportional to 131,862.40, 197,939.40 and 81,998.80

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Solution

The fourth proportional to 131,862.40, 197,939.40 and 81,998.80 is: 123,088.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,862.40 : 197,939.40 = 81,998.80 : x
  2. Step 2: Convert to fraction form
    131,862.40/197,939.40 = 81,998.80/x
  3. Step 3: Cross multiply
    131,862.40x = 197,939.40 × 81,998.80
  4. Step 4: Simplify right side
    131,862.40x = 16,230,793,272.72
  5. Step 5: Solve for x
    x = 16,230,793,272.72/131,862.40
  6. Step 6: Final answer
    x = 123,088.87

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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.