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Finding the Fourth Proportional to 108,391.21, 162,376.39 and 79,876.41

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Solution

The fourth proportional to 108,391.21, 162,376.39 and 79,876.41 is: 119,659.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,391.21 : 162,376.39 = 79,876.41 : x
  2. Step 2: Convert to fraction form
    108,391.21/162,376.39 = 79,876.41/x
  3. Step 3: Cross multiply
    108,391.21x = 162,376.39 × 79,876.41
  4. Step 4: Simplify right side
    108,391.21x = 12,970,043,101.96
  5. Step 5: Solve for x
    x = 12,970,043,101.96/108,391.21
  6. Step 6: Final answer
    x = 119,659.55

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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.