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Finding the Fourth Proportional to 68,210.42, 102,321.62 and 20,836.20

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Solution

The fourth proportional to 68,210.42, 102,321.62 and 20,836.20 is: 31,256.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,210.42 : 102,321.62 = 20,836.20 : x
  2. Step 2: Convert to fraction form
    68,210.42/102,321.62 = 20,836.20/x
  3. Step 3: Cross multiply
    68,210.42x = 102,321.62 × 20,836.20
  4. Step 4: Simplify right side
    68,210.42x = 2,131,993,738.64
  5. Step 5: Solve for x
    x = 2,131,993,738.64/68,210.42
  6. Step 6: Final answer
    x = 31,256.13

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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.