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Finding the Fourth Proportional to 72,961.44, 100,686.90 and 39,427.44

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Solution

The fourth proportional to 72,961.44, 100,686.90 and 39,427.44 is: 54,409.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,961.44 : 100,686.90 = 39,427.44 : x
  2. Step 2: Convert to fraction form
    72,961.44/100,686.90 = 39,427.44/x
  3. Step 3: Cross multiply
    72,961.44x = 100,686.90 × 39,427.44
  4. Step 4: Simplify right side
    72,961.44x = 3,969,826,708.54
  5. Step 5: Solve for x
    x = 3,969,826,708.54/72,961.44
  6. Step 6: Final answer
    x = 54,409.93

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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.