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Finding the Fourth Proportional to 72,930.88, 100,644.70 and 39,396.88

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Solution

The fourth proportional to 72,930.88, 100,644.70 and 39,396.88 is: 54,367.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,930.88 : 100,644.70 = 39,396.88 : x
  2. Step 2: Convert to fraction form
    72,930.88/100,644.70 = 39,396.88/x
  3. Step 3: Cross multiply
    72,930.88x = 100,644.70 × 39,396.88
  4. Step 4: Simplify right side
    72,930.88x = 3,965,086,665.31
  5. Step 5: Solve for x
    x = 3,965,086,665.31/72,930.88
  6. Step 6: Final answer
    x = 54,367.74

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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.