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Finding the Fourth Proportional to 108,640.30, 162,766.05 and 91,921.90

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Solution

The fourth proportional to 108,640.30, 162,766.05 and 91,921.90 is: 137,718.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,640.30 : 162,766.05 = 91,921.90 : x
  2. Step 2: Convert to fraction form
    108,640.30/162,766.05 = 91,921.90/x
  3. Step 3: Cross multiply
    108,640.30x = 162,766.05 × 91,921.90
  4. Step 4: Simplify right side
    108,640.30x = 14,961,764,571.50
  5. Step 5: Solve for x
    x = 14,961,764,571.50/108,640.30
  6. Step 6: Final answer
    x = 137,718.37

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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.