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Finding the Fourth Proportional to 138.42, 190.88 and 112.18

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Solution

The fourth proportional to 138.42, 190.88 and 112.18 is: 154.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.42 : 190.88 = 112.18 : x
  2. Step 2: Convert to fraction form
    138.42/190.88 = 112.18/x
  3. Step 3: Cross multiply
    138.42x = 190.88 × 112.18
  4. Step 4: Simplify right side
    138.42x = 21,412.92
  5. Step 5: Solve for x
    x = 21,412.92/138.42
  6. Step 6: Final answer
    x = 154.70

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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.