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Finding the Fourth Proportional to 72,906.80, 100,611.38 and 39,372.80

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Solution

The fourth proportional to 72,906.80, 100,611.38 and 39,372.80 is: 54,334.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,906.80 : 100,611.38 = 39,372.80 : x
  2. Step 2: Convert to fraction form
    72,906.80/100,611.38 = 39,372.80/x
  3. Step 3: Cross multiply
    72,906.80x = 100,611.38 × 39,372.80
  4. Step 4: Simplify right side
    72,906.80x = 3,961,351,042.54
  5. Step 5: Solve for x
    x = 3,961,351,042.54/72,906.80
  6. Step 6: Final answer
    x = 54,334.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.