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Finding the Fourth Proportional to 81,212.80, 121,934.40 and 50,108.80

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Solution

The fourth proportional to 81,212.80, 121,934.40 and 50,108.80 is: 75,234.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,212.80 : 121,934.40 = 50,108.80 : x
  2. Step 2: Convert to fraction form
    81,212.80/121,934.40 = 50,108.80/x
  3. Step 3: Cross multiply
    81,212.80x = 121,934.40 × 50,108.80
  4. Step 4: Simplify right side
    81,212.80x = 6,109,986,462.72
  5. Step 5: Solve for x
    x = 6,109,986,462.72/81,212.80
  6. Step 6: Final answer
    x = 75,234.28

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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.