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Finding the Fourth Proportional to 63,765.54, 87,996.92 and 39,905.78

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Solution

The fourth proportional to 63,765.54, 87,996.92 and 39,905.78 is: 55,070.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,765.54 : 87,996.92 = 39,905.78 : x
  2. Step 2: Convert to fraction form
    63,765.54/87,996.92 = 39,905.78/x
  3. Step 3: Cross multiply
    63,765.54x = 87,996.92 × 39,905.78
  4. Step 4: Simplify right side
    63,765.54x = 3,511,585,090.68
  5. Step 5: Solve for x
    x = 3,511,585,090.68/63,765.54
  6. Step 6: Final answer
    x = 55,070.26

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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.