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Finding the Fourth Proportional to 100.27, 137.94 and 83.80

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Solution

The fourth proportional to 100.27, 137.94 and 83.80 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.27 : 137.94 = 83.80 : x
  2. Step 2: Convert to fraction form
    100.27/137.94 = 83.80/x
  3. Step 3: Cross multiply
    100.27x = 137.94 × 83.80
  4. Step 4: Simplify right side
    100.27x = 11,559.37
  5. Step 5: Solve for x
    x = 11,559.37/100.27
  6. Step 6: Final answer
    x = 115.28

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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.