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Finding the Fourth Proportional to 72,906.39, 100,611.84 and 40,640.09

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Solution

The fourth proportional to 72,906.39, 100,611.84 and 40,640.09 is: 56,083.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,906.39 : 100,611.84 = 40,640.09 : x
  2. Step 2: Convert to fraction form
    72,906.39/100,611.84 = 40,640.09/x
  3. Step 3: Cross multiply
    72,906.39x = 100,611.84 × 40,640.09
  4. Step 4: Simplify right side
    72,906.39x = 4,088,873,729.61
  5. Step 5: Solve for x
    x = 4,088,873,729.61/72,906.39
  6. Step 6: Final answer
    x = 56,083.89

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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.