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Finding the Fourth Proportional to 104,857.70, 156,940.95 and 81,356.90

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Solution

The fourth proportional to 104,857.70, 156,940.95 and 81,356.90 is: 121,767.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,857.70 : 156,940.95 = 81,356.90 : x
  2. Step 2: Convert to fraction form
    104,857.70/156,940.95 = 81,356.90/x
  3. Step 3: Cross multiply
    104,857.70x = 156,940.95 × 81,356.90
  4. Step 4: Simplify right side
    104,857.70x = 12,768,229,175.06
  5. Step 5: Solve for x
    x = 12,768,229,175.06/104,857.70
  6. Step 6: Final answer
    x = 121,767.21

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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.