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Finding the Fourth Proportional to 138.09, 190.65 and 137.49

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Solution

The fourth proportional to 138.09, 190.65 and 137.49 is: 189.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.09 : 190.65 = 137.49 : x
  2. Step 2: Convert to fraction form
    138.09/190.65 = 137.49/x
  3. Step 3: Cross multiply
    138.09x = 190.65 × 137.49
  4. Step 4: Simplify right side
    138.09x = 26,212.47
  5. Step 5: Solve for x
    x = 26,212.47/138.09
  6. Step 6: Final answer
    x = 189.82

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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.