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Finding the Fourth Proportional to 68,549.60, 102,831.70 and 21,791.54

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Solution

The fourth proportional to 68,549.60, 102,831.70 and 21,791.54 is: 32,689.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,549.60 : 102,831.70 = 21,791.54 : x
  2. Step 2: Convert to fraction form
    68,549.60/102,831.70 = 21,791.54/x
  3. Step 3: Cross multiply
    68,549.60x = 102,831.70 × 21,791.54
  4. Step 4: Simplify right side
    68,549.60x = 2,240,861,103.82
  5. Step 5: Solve for x
    x = 2,240,861,103.82/68,549.60
  6. Step 6: Final answer
    x = 32,689.63

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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.