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Finding the Fourth Proportional to 100.35, 138.44 and 83.75

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Solution

The fourth proportional to 100.35, 138.44 and 83.75 is: 115.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.35 : 138.44 = 83.75 : x
  2. Step 2: Convert to fraction form
    100.35/138.44 = 83.75/x
  3. Step 3: Cross multiply
    100.35x = 138.44 × 83.75
  4. Step 4: Simplify right side
    100.35x = 11,593.87
  5. Step 5: Solve for x
    x = 11,593.87/100.35
  6. Step 6: Final answer
    x = 115.53

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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.