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Finding the Fourth Proportional to 151.35, 208.91 and 138.14

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Solution

The fourth proportional to 151.35, 208.91 and 138.14 is: 190.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.35 : 208.91 = 138.14 : x
  2. Step 2: Convert to fraction form
    151.35/208.91 = 138.14/x
  3. Step 3: Cross multiply
    151.35x = 208.91 × 138.14
  4. Step 4: Simplify right side
    151.35x = 28,858.91
  5. Step 5: Solve for x
    x = 28,858.91/151.35
  6. Step 6: Final answer
    x = 190.68

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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.