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Finding the Fourth Proportional to 72,906.20, 100,610.55 and 39,372.20

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Solution

The fourth proportional to 72,906.20, 100,610.55 and 39,372.20 is: 54,333.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,906.20 : 100,610.55 = 39,372.20 : x
  2. Step 2: Convert to fraction form
    72,906.20/100,610.55 = 39,372.20/x
  3. Step 3: Cross multiply
    72,906.20x = 100,610.55 × 39,372.20
  4. Step 4: Simplify right side
    72,906.20x = 3,961,258,292.09
  5. Step 5: Solve for x
    x = 3,961,258,292.09/72,906.20
  6. Step 6: Final answer
    x = 54,333.63

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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.