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Finding the Fourth Proportional to 72,891.45, 109,329.89 and 20,301.39

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Solution

The fourth proportional to 72,891.45, 109,329.89 and 20,301.39 is: 30,450.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,891.45 : 109,329.89 = 20,301.39 : x
  2. Step 2: Convert to fraction form
    72,891.45/109,329.89 = 20,301.39/x
  3. Step 3: Cross multiply
    72,891.45x = 109,329.89 × 20,301.39
  4. Step 4: Simplify right side
    72,891.45x = 2,219,548,634.04
  5. Step 5: Solve for x
    x = 2,219,548,634.04/72,891.45
  6. Step 6: Final answer
    x = 30,450.05

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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.