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Finding the Fourth Proportional to 138.49, 190.45 and 110.80

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Solution

The fourth proportional to 138.49, 190.45 and 110.80 is: 152.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.49 : 190.45 = 110.80 : x
  2. Step 2: Convert to fraction form
    138.49/190.45 = 110.80/x
  3. Step 3: Cross multiply
    138.49x = 190.45 × 110.80
  4. Step 4: Simplify right side
    138.49x = 21,101.86
  5. Step 5: Solve for x
    x = 21,101.86/138.49
  6. Step 6: Final answer
    x = 152.37

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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.