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Finding the Fourth Proportional to 67,414.60, 101,121.90 and 20,661.40

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Solution

The fourth proportional to 67,414.60, 101,121.90 and 20,661.40 is: 30,992.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,414.60 : 101,121.90 = 20,661.40 : x
  2. Step 2: Convert to fraction form
    67,414.60/101,121.90 = 20,661.40/x
  3. Step 3: Cross multiply
    67,414.60x = 101,121.90 × 20,661.40
  4. Step 4: Simplify right side
    67,414.60x = 2,089,320,024.66
  5. Step 5: Solve for x
    x = 2,089,320,024.66/67,414.60
  6. Step 6: Final answer
    x = 30,992.10

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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.