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Finding the Fourth Proportional to 67,170.80, 100,759.80 and 20,420.12

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Solution

The fourth proportional to 67,170.80, 100,759.80 and 20,420.12 is: 30,631.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,170.80 : 100,759.80 = 20,420.12 : x
  2. Step 2: Convert to fraction form
    67,170.80/100,759.80 = 20,420.12/x
  3. Step 3: Cross multiply
    67,170.80x = 100,759.80 × 20,420.12
  4. Step 4: Simplify right side
    67,170.80x = 2,057,527,207.18
  5. Step 5: Solve for x
    x = 2,057,527,207.18/67,170.80
  6. Step 6: Final answer
    x = 30,631.27

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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.