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Finding the Fourth Proportional to 135,505.80, 186,995.40 and 81,793.08

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Solution

The fourth proportional to 135,505.80, 186,995.40 and 81,793.08 is: 112,872.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,505.80 : 186,995.40 = 81,793.08 : x
  2. Step 2: Convert to fraction form
    135,505.80/186,995.40 = 81,793.08/x
  3. Step 3: Cross multiply
    135,505.80x = 186,995.40 × 81,793.08
  4. Step 4: Simplify right side
    135,505.80x = 15,294,929,711.83
  5. Step 5: Solve for x
    x = 15,294,929,711.83/135,505.80
  6. Step 6: Final answer
    x = 112,872.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.