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Finding the Fourth Proportional to 68,683.88, 103,020.71 and 21,299.34

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Solution

The fourth proportional to 68,683.88, 103,020.71 and 21,299.34 is: 31,947.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,683.88 : 103,020.71 = 21,299.34 : x
  2. Step 2: Convert to fraction form
    68,683.88/103,020.71 = 21,299.34/x
  3. Step 3: Cross multiply
    68,683.88x = 103,020.71 × 21,299.34
  4. Step 4: Simplify right side
    68,683.88x = 2,194,273,409.16
  5. Step 5: Solve for x
    x = 2,194,273,409.16/68,683.88
  6. Step 6: Final answer
    x = 31,947.43

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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.