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Finding the Fourth Proportional to 108,042.20, 162,209.10 and 85,880.60

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Solution

The fourth proportional to 108,042.20, 162,209.10 and 85,880.60 is: 128,936.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,042.20 : 162,209.10 = 85,880.60 : x
  2. Step 2: Convert to fraction form
    108,042.20/162,209.10 = 85,880.60/x
  3. Step 3: Cross multiply
    108,042.20x = 162,209.10 × 85,880.60
  4. Step 4: Simplify right side
    108,042.20x = 13,930,614,833.46
  5. Step 5: Solve for x
    x = 13,930,614,833.46/108,042.20
  6. Step 6: Final answer
    x = 128,936.79

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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.