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Finding the Fourth Proportional to 68,659.09, 102,990.45 and 21,911.98

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Solution

The fourth proportional to 68,659.09, 102,990.45 and 21,911.98 is: 32,868.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,659.09 : 102,990.45 = 21,911.98 : x
  2. Step 2: Convert to fraction form
    68,659.09/102,990.45 = 21,911.98/x
  3. Step 3: Cross multiply
    68,659.09x = 102,990.45 × 21,911.98
  4. Step 4: Simplify right side
    68,659.09x = 2,256,724,680.59
  5. Step 5: Solve for x
    x = 2,256,724,680.59/68,659.09
  6. Step 6: Final answer
    x = 32,868.55

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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.