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Finding the Fourth Proportional to 118.40, 164.18 and 111.20

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Solution

The fourth proportional to 118.40, 164.18 and 111.20 is: 154.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.40 : 164.18 = 111.20 : x
  2. Step 2: Convert to fraction form
    118.40/164.18 = 111.20/x
  3. Step 3: Cross multiply
    118.40x = 164.18 × 111.20
  4. Step 4: Simplify right side
    118.40x = 18,256.82
  5. Step 5: Solve for x
    x = 18,256.82/118.40
  6. Step 6: Final answer
    x = 154.20

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.