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Finding the Fourth Proportional to 68,751.70, 103,129.98 and 21,998.50

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Solution

The fourth proportional to 68,751.70, 103,129.98 and 21,998.50 is: 32,998.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,751.70 : 103,129.98 = 21,998.50 : x
  2. Step 2: Convert to fraction form
    68,751.70/103,129.98 = 21,998.50/x
  3. Step 3: Cross multiply
    68,751.70x = 103,129.98 × 21,998.50
  4. Step 4: Simplify right side
    68,751.70x = 2,268,704,865.03
  5. Step 5: Solve for x
    x = 2,268,704,865.03/68,751.70
  6. Step 6: Final answer
    x = 32,998.53

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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.