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Finding the Fourth Proportional to 100,687.92, 138,914.74 and 62,433.69

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Solution

The fourth proportional to 100,687.92, 138,914.74 and 62,433.69 is: 86,137.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,687.92 : 138,914.74 = 62,433.69 : x
  2. Step 2: Convert to fraction form
    100,687.92/138,914.74 = 62,433.69/x
  3. Step 3: Cross multiply
    100,687.92x = 138,914.74 × 62,433.69
  4. Step 4: Simplify right side
    100,687.92x = 8,672,959,891.63
  5. Step 5: Solve for x
    x = 8,672,959,891.63/100,687.92
  6. Step 6: Final answer
    x = 86,137.05

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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.