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Finding the Fourth Proportional to 99,694.80, 149,772.60 and 68,590.80

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Solution

The fourth proportional to 99,694.80, 149,772.60 and 68,590.80 is: 103,044.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,694.80 : 149,772.60 = 68,590.80 : x
  2. Step 2: Convert to fraction form
    99,694.80/149,772.60 = 68,590.80/x
  3. Step 3: Cross multiply
    99,694.80x = 149,772.60 × 68,590.80
  4. Step 4: Simplify right side
    99,694.80x = 10,273,022,452.08
  5. Step 5: Solve for x
    x = 10,273,022,452.08/99,694.80
  6. Step 6: Final answer
    x = 103,044.72

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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.