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Finding the Fourth Proportional to 90,105.54, 135,213.90 and 45,764.12

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Solution

The fourth proportional to 90,105.54, 135,213.90 and 45,764.12 is: 68,674.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,105.54 : 135,213.90 = 45,764.12 : x
  2. Step 2: Convert to fraction form
    90,105.54/135,213.90 = 45,764.12/x
  3. Step 3: Cross multiply
    90,105.54x = 135,213.90 × 45,764.12
  4. Step 4: Simplify right side
    90,105.54x = 6,187,944,297.58
  5. Step 5: Solve for x
    x = 6,187,944,297.58/90,105.54
  6. Step 6: Final answer
    x = 68,674.40

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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.