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Finding the Fourth Proportional to 90,699.39, 125,163 and 50,412.78

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Solution

The fourth proportional to 90,699.39, 125,163 and 50,412.78 is: 69,568.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,699.39 : 125,163 = 50,412.78 : x
  2. Step 2: Convert to fraction form
    90,699.39/125,163 = 50,412.78/x
  3. Step 3: Cross multiply
    90,699.39x = 125,163 × 50,412.78
  4. Step 4: Simplify right side
    90,699.39x = 6,309,814,783.14
  5. Step 5: Solve for x
    x = 6,309,814,783.14/90,699.39
  6. Step 6: Final answer
    x = 69,568.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.