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Finding the Fourth Proportional to 68,636.80, 102,945.60 and 21,894.40

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Solution

The fourth proportional to 68,636.80, 102,945.60 and 21,894.40 is: 32,838.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,636.80 : 102,945.60 = 21,894.40 : x
  2. Step 2: Convert to fraction form
    68,636.80/102,945.60 = 21,894.40/x
  3. Step 3: Cross multiply
    68,636.80x = 102,945.60 × 21,894.40
  4. Step 4: Simplify right side
    68,636.80x = 2,253,932,144.64
  5. Step 5: Solve for x
    x = 2,253,932,144.64/68,636.80
  6. Step 6: Final answer
    x = 32,838.54

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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.