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Finding the Fourth Proportional to 68,738.96, 103,106.88 and 21,991.68

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Solution

The fourth proportional to 68,738.96, 103,106.88 and 21,991.68 is: 32,987.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,738.96 : 103,106.88 = 21,991.68 : x
  2. Step 2: Convert to fraction form
    68,738.96/103,106.88 = 21,991.68/x
  3. Step 3: Cross multiply
    68,738.96x = 103,106.88 × 21,991.68
  4. Step 4: Simplify right side
    68,738.96x = 2,267,493,510.76
  5. Step 5: Solve for x
    x = 2,267,493,510.76/68,738.96
  6. Step 6: Final answer
    x = 32,987.02

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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.