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Finding the Fourth Proportional to 72,906.70, 100,611.25 and 39,372.70

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Solution

The fourth proportional to 72,906.70, 100,611.25 and 39,372.70 is: 54,334.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,906.70 : 100,611.25 = 39,372.70 : x
  2. Step 2: Convert to fraction form
    72,906.70/100,611.25 = 39,372.70/x
  3. Step 3: Cross multiply
    72,906.70x = 100,611.25 × 39,372.70
  4. Step 4: Simplify right side
    72,906.70x = 3,961,335,862.96
  5. Step 5: Solve for x
    x = 3,961,335,862.96/72,906.70
  6. Step 6: Final answer
    x = 54,334.32

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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.