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Finding the Fourth Proportional to 279,645.67, 419,409.78 and 90,123.09

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Solution

The fourth proportional to 279,645.67, 419,409.78 and 90,123.09 is: 135,165.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,645.67 : 419,409.78 = 90,123.09 : x
  2. Step 2: Convert to fraction form
    279,645.67/419,409.78 = 90,123.09/x
  3. Step 3: Cross multiply
    279,645.67x = 419,409.78 × 90,123.09
  4. Step 4: Simplify right side
    279,645.67x = 37,798,505,349.82
  5. Step 5: Solve for x
    x = 37,798,505,349.82/279,645.67
  6. Step 6: Final answer
    x = 135,165.71

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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.