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Finding the Fourth Proportional to 68,139.60, 102,214.20 and 38,571.60

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Solution

The fourth proportional to 68,139.60, 102,214.20 and 38,571.60 is: 57,860.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,139.60 : 102,214.20 = 38,571.60 : x
  2. Step 2: Convert to fraction form
    68,139.60/102,214.20 = 38,571.60/x
  3. Step 3: Cross multiply
    68,139.60x = 102,214.20 × 38,571.60
  4. Step 4: Simplify right side
    68,139.60x = 3,942,565,236.72
  5. Step 5: Solve for x
    x = 3,942,565,236.72/68,139.60
  6. Step 6: Final answer
    x = 57,860.12

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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.