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Finding the Fourth Proportional to 278,987.50, 418,481.45 and 91,999

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Solution

The fourth proportional to 278,987.50, 418,481.45 and 91,999 is: 137,998.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,987.50 : 418,481.45 = 91,999 : x
  2. Step 2: Convert to fraction form
    278,987.50/418,481.45 = 91,999/x
  3. Step 3: Cross multiply
    278,987.50x = 418,481.45 × 91,999
  4. Step 4: Simplify right side
    278,987.50x = 38,499,874,918.55
  5. Step 5: Solve for x
    x = 38,499,874,918.55/278,987.50
  6. Step 6: Final answer
    x = 137,998.57

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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.