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Finding the Fourth Proportional to 74,506.87, 111,765.79 and 21,918.63

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Solution

The fourth proportional to 74,506.87, 111,765.79 and 21,918.63 is: 32,879.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,506.87 : 111,765.79 = 21,918.63 : x
  2. Step 2: Convert to fraction form
    74,506.87/111,765.79 = 21,918.63/x
  3. Step 3: Cross multiply
    74,506.87x = 111,765.79 × 21,918.63
  4. Step 4: Simplify right side
    74,506.87x = 2,449,753,444.19
  5. Step 5: Solve for x
    x = 2,449,753,444.19/74,506.87
  6. Step 6: Final answer
    x = 32,879.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.