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Finding the Fourth Proportional to 81,891.56, 122,838.88 and 25,730.64

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Solution

The fourth proportional to 81,891.56, 122,838.88 and 25,730.64 is: 38,596.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,891.56 : 122,838.88 = 25,730.64 : x
  2. Step 2: Convert to fraction form
    81,891.56/122,838.88 = 25,730.64/x
  3. Step 3: Cross multiply
    81,891.56x = 122,838.88 × 25,730.64
  4. Step 4: Simplify right side
    81,891.56x = 3,160,722,999.28
  5. Step 5: Solve for x
    x = 3,160,722,999.28/81,891.56
  6. Step 6: Final answer
    x = 38,596.44

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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.