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Finding the Fourth Proportional to 138,640.80, 207,961.20 and 110,100.45

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Solution

The fourth proportional to 138,640.80, 207,961.20 and 110,100.45 is: 165,150.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,640.80 : 207,961.20 = 110,100.45 : x
  2. Step 2: Convert to fraction form
    138,640.80/207,961.20 = 110,100.45/x
  3. Step 3: Cross multiply
    138,640.80x = 207,961.20 × 110,100.45
  4. Step 4: Simplify right side
    138,640.80x = 22,896,621,702.54
  5. Step 5: Solve for x
    x = 22,896,621,702.54/138,640.80
  6. Step 6: Final answer
    x = 165,150.68

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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.