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Finding the Fourth Proportional to 68,735.39, 103,128.62 and 21,991.91

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Solution

The fourth proportional to 68,735.39, 103,128.62 and 21,991.91 is: 32,996.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,735.39 : 103,128.62 = 21,991.91 : x
  2. Step 2: Convert to fraction form
    68,735.39/103,128.62 = 21,991.91/x
  3. Step 3: Cross multiply
    68,735.39x = 103,128.62 × 21,991.91
  4. Step 4: Simplify right side
    68,735.39x = 2,267,994,703.86
  5. Step 5: Solve for x
    x = 2,267,994,703.86/68,735.39
  6. Step 6: Final answer
    x = 32,996.03

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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.