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Finding the Fourth Proportional to 99,579.92, 149,123.90 and 74,218.60

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Solution

The fourth proportional to 99,579.92, 149,123.90 and 74,218.60 is: 111,144.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,579.92 : 149,123.90 = 74,218.60 : x
  2. Step 2: Convert to fraction form
    99,579.92/149,123.90 = 74,218.60/x
  3. Step 3: Cross multiply
    99,579.92x = 149,123.90 × 74,218.60
  4. Step 4: Simplify right side
    99,579.92x = 11,067,767,084.54
  5. Step 5: Solve for x
    x = 11,067,767,084.54/99,579.92
  6. Step 6: Final answer
    x = 111,144.57

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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.