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Finding the Fourth Proportional to 85,976.87, 128,990.93 and 41,031.97

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Solution

The fourth proportional to 85,976.87, 128,990.93 and 41,031.97 is: 61,560.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,976.87 : 128,990.93 = 41,031.97 : x
  2. Step 2: Convert to fraction form
    85,976.87/128,990.93 = 41,031.97/x
  3. Step 3: Cross multiply
    85,976.87x = 128,990.93 × 41,031.97
  4. Step 4: Simplify right side
    85,976.87x = 5,292,751,442.39
  5. Step 5: Solve for x
    x = 5,292,751,442.39/85,976.87
  6. Step 6: Final answer
    x = 61,560.18

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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.