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Finding the Fourth Proportional to 68,662.20, 102,791.70 and 51,209.40

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Solution

The fourth proportional to 68,662.20, 102,791.70 and 51,209.40 is: 76,663.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,662.20 : 102,791.70 = 51,209.40 : x
  2. Step 2: Convert to fraction form
    68,662.20/102,791.70 = 51,209.40/x
  3. Step 3: Cross multiply
    68,662.20x = 102,791.70 × 51,209.40
  4. Step 4: Simplify right side
    68,662.20x = 5,263,901,281.98
  5. Step 5: Solve for x
    x = 5,263,901,281.98/68,662.20
  6. Step 6: Final answer
    x = 76,663.74

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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.