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Finding the Fourth Proportional to 100,647.48, 138,765.42 and 62,907.96

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Solution

The fourth proportional to 100,647.48, 138,765.42 and 62,907.96 is: 86,732.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,647.48 : 138,765.42 = 62,907.96 : x
  2. Step 2: Convert to fraction form
    100,647.48/138,765.42 = 62,907.96/x
  3. Step 3: Cross multiply
    100,647.48x = 138,765.42 × 62,907.96
  4. Step 4: Simplify right side
    100,647.48x = 8,729,449,490.74
  5. Step 5: Solve for x
    x = 8,729,449,490.74/100,647.48
  6. Step 6: Final answer
    x = 86,732.92

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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.