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Finding the Fourth Proportional to 104,883.20, 156,979.20 and 81,382.40

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Solution

The fourth proportional to 104,883.20, 156,979.20 and 81,382.40 is: 121,805.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,883.20 : 156,979.20 = 81,382.40 : x
  2. Step 2: Convert to fraction form
    104,883.20/156,979.20 = 81,382.40/x
  3. Step 3: Cross multiply
    104,883.20x = 156,979.20 × 81,382.40
  4. Step 4: Simplify right side
    104,883.20x = 12,775,344,046.08
  5. Step 5: Solve for x
    x = 12,775,344,046.08/104,883.20
  6. Step 6: Final answer
    x = 121,805.44

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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.