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Finding the Fourth Proportional to 68,502.41, 102,763.42 and 21,121.52

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Solution

The fourth proportional to 68,502.41, 102,763.42 and 21,121.52 is: 31,685.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,502.41 : 102,763.42 = 21,121.52 : x
  2. Step 2: Convert to fraction form
    68,502.41/102,763.42 = 21,121.52/x
  3. Step 3: Cross multiply
    68,502.41x = 102,763.42 × 21,121.52
  4. Step 4: Simplify right side
    68,502.41x = 2,170,519,064.18
  5. Step 5: Solve for x
    x = 2,170,519,064.18/68,502.41
  6. Step 6: Final answer
    x = 31,685.29

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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.