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Finding the Fourth Proportional to 67,155.20, 100,728.48 and 20,408.48

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Solution

The fourth proportional to 67,155.20, 100,728.48 and 20,408.48 is: 30,611.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,155.20 : 100,728.48 = 20,408.48 : x
  2. Step 2: Convert to fraction form
    67,155.20/100,728.48 = 20,408.48/x
  3. Step 3: Cross multiply
    67,155.20x = 100,728.48 × 20,408.48
  4. Step 4: Simplify right side
    67,155.20x = 2,055,715,169.51
  5. Step 5: Solve for x
    x = 2,055,715,169.51/67,155.20
  6. Step 6: Final answer
    x = 30,611.41

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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.