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Finding the Fourth Proportional to 131.39, 180.77 and 100.12

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Solution

The fourth proportional to 131.39, 180.77 and 100.12 is: 137.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.39 : 180.77 = 100.12 : x
  2. Step 2: Convert to fraction form
    131.39/180.77 = 100.12/x
  3. Step 3: Cross multiply
    131.39x = 180.77 × 100.12
  4. Step 4: Simplify right side
    131.39x = 18,098.69
  5. Step 5: Solve for x
    x = 18,098.69/131.39
  6. Step 6: Final answer
    x = 137.75

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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.