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Finding the Fourth Proportional to 67,172.84, 100,755.60 and 20,422.07

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Solution

The fourth proportional to 67,172.84, 100,755.60 and 20,422.07 is: 30,631.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,172.84 : 100,755.60 = 20,422.07 : x
  2. Step 2: Convert to fraction form
    67,172.84/100,755.60 = 20,422.07/x
  3. Step 3: Cross multiply
    67,172.84x = 100,755.60 × 20,422.07
  4. Step 4: Simplify right side
    67,172.84x = 2,057,637,916.09
  5. Step 5: Solve for x
    x = 2,057,637,916.09/67,172.84
  6. Step 6: Final answer
    x = 30,631.99

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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.