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Finding the Fourth Proportional to 140,879.64, 194,418.72 and 77,217.42

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Solution

The fourth proportional to 140,879.64, 194,418.72 and 77,217.42 is: 106,562.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,879.64 : 194,418.72 = 77,217.42 : x
  2. Step 2: Convert to fraction form
    140,879.64/194,418.72 = 77,217.42/x
  3. Step 3: Cross multiply
    140,879.64x = 194,418.72 × 77,217.42
  4. Step 4: Simplify right side
    140,879.64x = 15,012,511,958.10
  5. Step 5: Solve for x
    x = 15,012,511,958.10/140,879.64
  6. Step 6: Final answer
    x = 106,562.68

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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.