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Finding the Fourth Proportional to 68,660.40, 102,990.60 and 39,169.20

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Solution

The fourth proportional to 68,660.40, 102,990.60 and 39,169.20 is: 58,753.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,660.40 : 102,990.60 = 39,169.20 : x
  2. Step 2: Convert to fraction form
    68,660.40/102,990.60 = 39,169.20/x
  3. Step 3: Cross multiply
    68,660.40x = 102,990.60 × 39,169.20
  4. Step 4: Simplify right side
    68,660.40x = 4,034,059,409.52
  5. Step 5: Solve for x
    x = 4,034,059,409.52/68,660.40
  6. Step 6: Final answer
    x = 58,753.80

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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.