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Finding the Fourth Proportional to 138.42, 208.44 and 100.17

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Solution

The fourth proportional to 138.42, 208.44 and 100.17 is: 150.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.42 : 208.44 = 100.17 : x
  2. Step 2: Convert to fraction form
    138.42/208.44 = 100.17/x
  3. Step 3: Cross multiply
    138.42x = 208.44 × 100.17
  4. Step 4: Simplify right side
    138.42x = 20,879.43
  5. Step 5: Solve for x
    x = 20,879.43/138.42
  6. Step 6: Final answer
    x = 150.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.