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Finding the Fourth Proportional to 100,661.91, 138,909.89 and 55,339.56

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Solution

The fourth proportional to 100,661.91, 138,909.89 and 55,339.56 is: 76,366.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,661.91 : 138,909.89 = 55,339.56 : x
  2. Step 2: Convert to fraction form
    100,661.91/138,909.89 = 55,339.56/x
  3. Step 3: Cross multiply
    100,661.91x = 138,909.89 × 55,339.56
  4. Step 4: Simplify right side
    100,661.91x = 7,687,211,808.79
  5. Step 5: Solve for x
    x = 7,687,211,808.79/100,661.91
  6. Step 6: Final answer
    x = 76,366.64

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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.