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Finding the Fourth Proportional to 108,078.60, 162,020.70 and 68,615.40

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Solution

The fourth proportional to 108,078.60, 162,020.70 and 68,615.40 is: 102,861.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,078.60 : 162,020.70 = 68,615.40 : x
  2. Step 2: Convert to fraction form
    108,078.60/162,020.70 = 68,615.40/x
  3. Step 3: Cross multiply
    108,078.60x = 162,020.70 × 68,615.40
  4. Step 4: Simplify right side
    108,078.60x = 11,117,115,138.78
  5. Step 5: Solve for x
    x = 11,117,115,138.78/108,078.60
  6. Step 6: Final answer
    x = 102,861.39

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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.