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Finding the Fourth Proportional to 12,640.90, 18,945.98 and 8,944.19

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Solution

The fourth proportional to 12,640.90, 18,945.98 and 8,944.19 is: 13,405.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.90 : 18,945.98 = 8,944.19 : x
  2. Step 2: Convert to fraction form
    12,640.90/18,945.98 = 8,944.19/x
  3. Step 3: Cross multiply
    12,640.90x = 18,945.98 × 8,944.19
  4. Step 4: Simplify right side
    12,640.90x = 169,456,447.50
  5. Step 5: Solve for x
    x = 169,456,447.50/12,640.90
  6. Step 6: Final answer
    x = 13,405.41

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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.