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Finding the Fourth Proportional to 68,660.43, 103,005.36 and 21,274.49

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Solution

The fourth proportional to 68,660.43, 103,005.36 and 21,274.49 is: 31,916.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,660.43 : 103,005.36 = 21,274.49 : x
  2. Step 2: Convert to fraction form
    68,660.43/103,005.36 = 21,274.49/x
  3. Step 3: Cross multiply
    68,660.43x = 103,005.36 × 21,274.49
  4. Step 4: Simplify right side
    68,660.43x = 2,191,385,986.24
  5. Step 5: Solve for x
    x = 2,191,385,986.24/68,660.43
  6. Step 6: Final answer
    x = 31,916.29

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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.