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Finding the Fourth Proportional to 68,720.70, 103,095.78 and 21,334.80

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Solution

The fourth proportional to 68,720.70, 103,095.78 and 21,334.80 is: 32,006.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,720.70 : 103,095.78 = 21,334.80 : x
  2. Step 2: Convert to fraction form
    68,720.70/103,095.78 = 21,334.80/x
  3. Step 3: Cross multiply
    68,720.70x = 103,095.78 × 21,334.80
  4. Step 4: Simplify right side
    68,720.70x = 2,199,527,847.14
  5. Step 5: Solve for x
    x = 2,199,527,847.14/68,720.70
  6. Step 6: Final answer
    x = 32,006.77

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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.