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Finding the Fourth Proportional to 218,752.94, 328,131.03 and 78,512.78

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Solution

The fourth proportional to 218,752.94, 328,131.03 and 78,512.78 is: 117,769.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,752.94 : 328,131.03 = 78,512.78 : x
  2. Step 2: Convert to fraction form
    218,752.94/328,131.03 = 78,512.78/x
  3. Step 3: Cross multiply
    218,752.94x = 328,131.03 × 78,512.78
  4. Step 4: Simplify right side
    218,752.94x = 25,762,479,369.56
  5. Step 5: Solve for x
    x = 25,762,479,369.56/218,752.94
  6. Step 6: Final answer
    x = 117,769.75

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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.