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Finding the Fourth Proportional to 133,820.80, 200,731.20 and 81,246.40

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Solution

The fourth proportional to 133,820.80, 200,731.20 and 81,246.40 is: 121,869.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    133,820.80 : 200,731.20 = 81,246.40 : x
  2. Step 2: Convert to fraction form
    133,820.80/200,731.20 = 81,246.40/x
  3. Step 3: Cross multiply
    133,820.80x = 200,731.20 × 81,246.40
  4. Step 4: Simplify right side
    133,820.80x = 16,308,687,367.68
  5. Step 5: Solve for x
    x = 16,308,687,367.68/133,820.80
  6. Step 6: Final answer
    x = 121,869.60

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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.