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Finding the Fourth Proportional to 68,750.70, 103,128.48 and 21,997.50

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Solution

The fourth proportional to 68,750.70, 103,128.48 and 21,997.50 is: 32,997.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,750.70 : 103,128.48 = 21,997.50 : x
  2. Step 2: Convert to fraction form
    68,750.70/103,128.48 = 21,997.50/x
  3. Step 3: Cross multiply
    68,750.70x = 103,128.48 × 21,997.50
  4. Step 4: Simplify right side
    68,750.70x = 2,268,568,738.80
  5. Step 5: Solve for x
    x = 2,268,568,738.80/68,750.70
  6. Step 6: Final answer
    x = 32,997.03

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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.