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Finding the Fourth Proportional to 218,707.21, 328,104.56 and 68,970.61

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Solution

The fourth proportional to 218,707.21, 328,104.56 and 68,970.61 is: 103,469.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,707.21 : 328,104.56 = 68,970.61 : x
  2. Step 2: Convert to fraction form
    218,707.21/328,104.56 = 68,970.61/x
  3. Step 3: Cross multiply
    218,707.21x = 328,104.56 × 68,970.61
  4. Step 4: Simplify right side
    218,707.21x = 22,629,571,646.98
  5. Step 5: Solve for x
    x = 22,629,571,646.98/218,707.21
  6. Step 6: Final answer
    x = 103,469.71

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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.