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Finding the Fourth Proportional to 80,110.21, 120,172.13 and 20,945.78

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Solution

The fourth proportional to 80,110.21, 120,172.13 and 20,945.78 is: 31,420.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,110.21 : 120,172.13 = 20,945.78 : x
  2. Step 2: Convert to fraction form
    80,110.21/120,172.13 = 20,945.78/x
  3. Step 3: Cross multiply
    80,110.21x = 120,172.13 × 20,945.78
  4. Step 4: Simplify right side
    80,110.21x = 2,517,098,997.11
  5. Step 5: Solve for x
    x = 2,517,098,997.11/80,110.21
  6. Step 6: Final answer
    x = 31,420.45

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1.5x scale

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.