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Finding the Fourth Proportional to 68,916.31, 103,381.62 and 18,996.42

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Solution

The fourth proportional to 68,916.31, 103,381.62 and 18,996.42 is: 28,496.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,916.31 : 103,381.62 = 18,996.42 : x
  2. Step 2: Convert to fraction form
    68,916.31/103,381.62 = 18,996.42/x
  3. Step 3: Cross multiply
    68,916.31x = 103,381.62 × 18,996.42
  4. Step 4: Simplify right side
    68,916.31x = 1,963,880,061.91
  5. Step 5: Solve for x
    x = 1,963,880,061.91/68,916.31
  6. Step 6: Final answer
    x = 28,496.59

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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.