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Finding the Fourth Proportional to 68,568.80, 102,863.04 and 21,188.03

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Solution

The fourth proportional to 68,568.80, 102,863.04 and 21,188.03 is: 31,785.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,568.80 : 102,863.04 = 21,188.03 : x
  2. Step 2: Convert to fraction form
    68,568.80/102,863.04 = 21,188.03/x
  3. Step 3: Cross multiply
    68,568.80x = 102,863.04 × 21,188.03
  4. Step 4: Simplify right side
    68,568.80x = 2,179,465,281.43
  5. Step 5: Solve for x
    x = 2,179,465,281.43/68,568.80
  6. Step 6: Final answer
    x = 31,785.09

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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.