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Finding the Fourth Proportional to 81,805.36, 112,825.56 and 54,939.76

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Solution

The fourth proportional to 81,805.36, 112,825.56 and 54,939.76 is: 75,772.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,805.36 : 112,825.56 = 54,939.76 : x
  2. Step 2: Convert to fraction form
    81,805.36/112,825.56 = 54,939.76/x
  3. Step 3: Cross multiply
    81,805.36x = 112,825.56 × 54,939.76
  4. Step 4: Simplify right side
    81,805.36x = 6,198,609,188.27
  5. Step 5: Solve for x
    x = 6,198,609,188.27/81,805.36
  6. Step 6: Final answer
    x = 75,772.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.