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Finding the Fourth Proportional to 72,939.75, 100,656.86 and 39,405.75

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Solution

The fourth proportional to 72,939.75, 100,656.86 and 39,405.75 is: 54,379.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,939.75 : 100,656.86 = 39,405.75 : x
  2. Step 2: Convert to fraction form
    72,939.75/100,656.86 = 39,405.75/x
  3. Step 3: Cross multiply
    72,939.75x = 100,656.86 × 39,405.75
  4. Step 4: Simplify right side
    72,939.75x = 3,966,458,863.92
  5. Step 5: Solve for x
    x = 3,966,458,863.92/72,939.75
  6. Step 6: Final answer
    x = 54,379.94

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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.