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Finding the Fourth Proportional to 137.88, 190.20 and 115.92

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Solution

The fourth proportional to 137.88, 190.20 and 115.92 is: 159.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.88 : 190.20 = 115.92 : x
  2. Step 2: Convert to fraction form
    137.88/190.20 = 115.92/x
  3. Step 3: Cross multiply
    137.88x = 190.20 × 115.92
  4. Step 4: Simplify right side
    137.88x = 22,047.98
  5. Step 5: Solve for x
    x = 22,047.98/137.88
  6. Step 6: Final answer
    x = 159.91

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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.