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Finding the Fourth Proportional to 72,961.71, 100,687.16 and 39,427.71

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Solution

The fourth proportional to 72,961.71, 100,687.16 and 39,427.71 is: 54,410.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,961.71 : 100,687.16 = 39,427.71 : x
  2. Step 2: Convert to fraction form
    72,961.71/100,687.16 = 39,427.71/x
  3. Step 3: Cross multiply
    72,961.71x = 100,687.16 × 39,427.71
  4. Step 4: Simplify right side
    72,961.71x = 3,969,864,145.20
  5. Step 5: Solve for x
    x = 3,969,864,145.20/72,961.71
  6. Step 6: Final answer
    x = 54,410.24

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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.