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Finding the Fourth Proportional to 68,620.46, 102,940.52 and 21,239.71

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Solution

The fourth proportional to 68,620.46, 102,940.52 and 21,239.71 is: 31,862.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,620.46 : 102,940.52 = 21,239.71 : x
  2. Step 2: Convert to fraction form
    68,620.46/102,940.52 = 21,239.71/x
  3. Step 3: Cross multiply
    68,620.46x = 102,940.52 × 21,239.71
  4. Step 4: Simplify right side
    68,620.46x = 2,186,426,897.23
  5. Step 5: Solve for x
    x = 2,186,426,897.23/68,620.46
  6. Step 6: Final answer
    x = 31,862.61

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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.