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Finding the Fourth Proportional to 68,620.18, 102,940.10 and 21,239.43

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Solution

The fourth proportional to 68,620.18, 102,940.10 and 21,239.43 is: 31,862.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,620.18 : 102,940.10 = 21,239.43 : x
  2. Step 2: Convert to fraction form
    68,620.18/102,940.10 = 21,239.43/x
  3. Step 3: Cross multiply
    68,620.18x = 102,940.10 × 21,239.43
  4. Step 4: Simplify right side
    68,620.18x = 2,186,388,825.13
  5. Step 5: Solve for x
    x = 2,186,388,825.13/68,620.18
  6. Step 6: Final answer
    x = 31,862.19

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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.