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Finding the Fourth Proportional to 72,246.20, 108,363.90 and 30,115.40

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Solution

The fourth proportional to 72,246.20, 108,363.90 and 30,115.40 is: 45,170.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,246.20 : 108,363.90 = 30,115.40 : x
  2. Step 2: Convert to fraction form
    72,246.20/108,363.90 = 30,115.40/x
  3. Step 3: Cross multiply
    72,246.20x = 108,363.90 × 30,115.40
  4. Step 4: Simplify right side
    72,246.20x = 3,263,422,194.06
  5. Step 5: Solve for x
    x = 3,263,422,194.06/72,246.20
  6. Step 6: Final answer
    x = 45,170.85

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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.