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Finding the Fourth Proportional to 100,661.49, 138,910.07 and 55,339.56

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Solution

The fourth proportional to 100,661.49, 138,910.07 and 55,339.56 is: 76,367.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,661.49 : 138,910.07 = 55,339.56 : x
  2. Step 2: Convert to fraction form
    100,661.49/138,910.07 = 55,339.56/x
  3. Step 3: Cross multiply
    100,661.49x = 138,910.07 × 55,339.56
  4. Step 4: Simplify right side
    100,661.49x = 7,687,222,291.72
  5. Step 5: Solve for x
    x = 7,687,222,291.72/100,661.49
  6. Step 6: Final answer
    x = 76,367.06

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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.