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Finding the Fourth Proportional to 108,081.60, 162,025.20 and 68,618.40

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Solution

The fourth proportional to 108,081.60, 162,025.20 and 68,618.40 is: 102,865.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,081.60 : 162,025.20 = 68,618.40 : x
  2. Step 2: Convert to fraction form
    108,081.60/162,025.20 = 68,618.40/x
  3. Step 3: Cross multiply
    108,081.60x = 162,025.20 × 68,618.40
  4. Step 4: Simplify right side
    108,081.60x = 11,117,909,983.68
  5. Step 5: Solve for x
    x = 11,117,909,983.68/108,081.60
  6. Step 6: Final answer
    x = 102,865.89

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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.