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Finding the Fourth Proportional to 68,812.40, 103,221.60 and 18,891.20

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Solution

The fourth proportional to 68,812.40, 103,221.60 and 18,891.20 is: 28,337.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,812.40 : 103,221.60 = 18,891.20 : x
  2. Step 2: Convert to fraction form
    68,812.40/103,221.60 = 18,891.20/x
  3. Step 3: Cross multiply
    68,812.40x = 103,221.60 × 18,891.20
  4. Step 4: Simplify right side
    68,812.40x = 1,949,979,889.92
  5. Step 5: Solve for x
    x = 1,949,979,889.92/68,812.40
  6. Step 6: Final answer
    x = 28,337.62

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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.