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Finding the Fourth Proportional to 138.11, 190.28 and 116.24

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Solution

The fourth proportional to 138.11, 190.28 and 116.24 is: 160.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.11 : 190.28 = 116.24 : x
  2. Step 2: Convert to fraction form
    138.11/190.28 = 116.24/x
  3. Step 3: Cross multiply
    138.11x = 190.28 × 116.24
  4. Step 4: Simplify right side
    138.11x = 22,117.49
  5. Step 5: Solve for x
    x = 22,117.49/138.11
  6. Step 6: Final answer
    x = 160.15

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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.