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Finding the Fourth Proportional to 73,218.80, 109,827.99 and 20,628.15

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Solution

The fourth proportional to 73,218.80, 109,827.99 and 20,628.15 is: 30,942.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,218.80 : 109,827.99 = 20,628.15 : x
  2. Step 2: Convert to fraction form
    73,218.80/109,827.99 = 20,628.15/x
  3. Step 3: Cross multiply
    73,218.80x = 109,827.99 × 20,628.15
  4. Step 4: Simplify right side
    73,218.80x = 2,265,548,251.92
  5. Step 5: Solve for x
    x = 2,265,548,251.92/73,218.80
  6. Step 6: Final answer
    x = 30,942.17

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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.