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Finding the Fourth Proportional to 68,680.64, 103,019.95 and 18,760.65

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Solution

The fourth proportional to 68,680.64, 103,019.95 and 18,760.65 is: 28,140.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,680.64 : 103,019.95 = 18,760.65 : x
  2. Step 2: Convert to fraction form
    68,680.64/103,019.95 = 18,760.65/x
  3. Step 3: Cross multiply
    68,680.64x = 103,019.95 × 18,760.65
  4. Step 4: Simplify right side
    68,680.64x = 1,932,720,862.09
  5. Step 5: Solve for x
    x = 1,932,720,862.09/68,680.64
  6. Step 6: Final answer
    x = 28,140.69

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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.