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Finding the Fourth Proportional to 129,203.70, 193,843.20 and 79,315.80

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Solution

The fourth proportional to 129,203.70, 193,843.20 and 79,315.80 is: 118,996.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,203.70 : 193,843.20 = 79,315.80 : x
  2. Step 2: Convert to fraction form
    129,203.70/193,843.20 = 79,315.80/x
  3. Step 3: Cross multiply
    129,203.70x = 193,843.20 × 79,315.80
  4. Step 4: Simplify right side
    129,203.70x = 15,374,828,482.56
  5. Step 5: Solve for x
    x = 15,374,828,482.56/129,203.70
  6. Step 6: Final answer
    x = 118,996.81

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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.