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Finding the Fourth Proportional to 45,408.88, 68,128.62 and 20,104.90

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Solution

The fourth proportional to 45,408.88, 68,128.62 and 20,104.90 is: 30,164.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,408.88 : 68,128.62 = 20,104.90 : x
  2. Step 2: Convert to fraction form
    45,408.88/68,128.62 = 20,104.90/x
  3. Step 3: Cross multiply
    45,408.88x = 68,128.62 × 20,104.90
  4. Step 4: Simplify right side
    45,408.88x = 1,369,719,092.24
  5. Step 5: Solve for x
    x = 1,369,719,092.24/45,408.88
  6. Step 6: Final answer
    x = 30,164.12

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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.