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Finding the Fourth Proportional to 137.84, 190.20 and 108.72

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Solution

The fourth proportional to 137.84, 190.20 and 108.72 is: 150.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.84 : 190.20 = 108.72 : x
  2. Step 2: Convert to fraction form
    137.84/190.20 = 108.72/x
  3. Step 3: Cross multiply
    137.84x = 190.20 × 108.72
  4. Step 4: Simplify right side
    137.84x = 20,678.54
  5. Step 5: Solve for x
    x = 20,678.54/137.84
  6. Step 6: Final answer
    x = 150.02

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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.