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Finding the Fourth Proportional to 278,879.68, 418,314.66 and 91,892.80

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Solution

The fourth proportional to 278,879.68, 418,314.66 and 91,892.80 is: 137,837.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,879.68 : 418,314.66 = 91,892.80 : x
  2. Step 2: Convert to fraction form
    278,879.68/418,314.66 = 91,892.80/x
  3. Step 3: Cross multiply
    278,879.68x = 418,314.66 × 91,892.80
  4. Step 4: Simplify right side
    278,879.68x = 38,440,105,388.45
  5. Step 5: Solve for x
    x = 38,440,105,388.45/278,879.68
  6. Step 6: Final answer
    x = 137,837.60

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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.