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Finding the Fourth Proportional to 68,911.80, 103,371.23 and 18,990.79

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Solution

The fourth proportional to 68,911.80, 103,371.23 and 18,990.79 is: 28,487.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,911.80 : 103,371.23 = 18,990.79 : x
  2. Step 2: Convert to fraction form
    68,911.80/103,371.23 = 18,990.79/x
  3. Step 3: Cross multiply
    68,911.80x = 103,371.23 × 18,990.79
  4. Step 4: Simplify right side
    68,911.80x = 1,963,101,320.97
  5. Step 5: Solve for x
    x = 1,963,101,320.97/68,911.80
  6. Step 6: Final answer
    x = 28,487.16

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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.