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Finding the Fourth Proportional to 100,685.62, 138,949.72 and 55,367.04

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Solution

The fourth proportional to 100,685.62, 138,949.72 and 55,367.04 is: 76,408.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,685.62 : 138,949.72 = 55,367.04 : x
  2. Step 2: Convert to fraction form
    100,685.62/138,949.72 = 55,367.04/x
  3. Step 3: Cross multiply
    100,685.62x = 138,949.72 × 55,367.04
  4. Step 4: Simplify right side
    100,685.62x = 7,693,234,705.23
  5. Step 5: Solve for x
    x = 7,693,234,705.23/100,685.62
  6. Step 6: Final answer
    x = 76,408.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.