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Finding the Fourth Proportional to 68,735.20, 103,135.20 and 51,239.20

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Solution

The fourth proportional to 68,735.20, 103,135.20 and 51,239.20 is: 76,882.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,735.20 : 103,135.20 = 51,239.20 : x
  2. Step 2: Convert to fraction form
    68,735.20/103,135.20 = 51,239.20/x
  3. Step 3: Cross multiply
    68,735.20x = 103,135.20 × 51,239.20
  4. Step 4: Simplify right side
    68,735.20x = 5,284,565,139.84
  5. Step 5: Solve for x
    x = 5,284,565,139.84/68,735.20
  6. Step 6: Final answer
    x = 76,882.95

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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.