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Finding the Fourth Proportional to 45,918.87, 68,879.07 and 12,638.73

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Solution

The fourth proportional to 45,918.87, 68,879.07 and 12,638.73 is: 18,958.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,918.87 : 68,879.07 = 12,638.73 : x
  2. Step 2: Convert to fraction form
    45,918.87/68,879.07 = 12,638.73/x
  3. Step 3: Cross multiply
    45,918.87x = 68,879.07 × 12,638.73
  4. Step 4: Simplify right side
    45,918.87x = 870,543,968.38
  5. Step 5: Solve for x
    x = 870,543,968.38/45,918.87
  6. Step 6: Final answer
    x = 18,958.31

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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.