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Finding the Fourth Proportional to 104,872.70, 156,963.45 and 81,371.90

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Solution

The fourth proportional to 104,872.70, 156,963.45 and 81,371.90 is: 121,789.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,872.70 : 156,963.45 = 81,371.90 : x
  2. Step 2: Convert to fraction form
    104,872.70/156,963.45 = 81,371.90/x
  3. Step 3: Cross multiply
    104,872.70x = 156,963.45 × 81,371.90
  4. Step 4: Simplify right side
    104,872.70x = 12,772,414,157.06
  5. Step 5: Solve for x
    x = 12,772,414,157.06/104,872.70
  6. Step 6: Final answer
    x = 121,789.70

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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.