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Finding the Fourth Proportional to 138.44, 190.90 and 117.80

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Solution

The fourth proportional to 138.44, 190.90 and 117.80 is: 162.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.44 : 190.90 = 117.80 : x
  2. Step 2: Convert to fraction form
    138.44/190.90 = 117.80/x
  3. Step 3: Cross multiply
    138.44x = 190.90 × 117.80
  4. Step 4: Simplify right side
    138.44x = 22,488.02
  5. Step 5: Solve for x
    x = 22,488.02/138.44
  6. Step 6: Final answer
    x = 162.44

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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.