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Finding the Fourth Proportional to 118.98, 164.20 and 69.86

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Solution

The fourth proportional to 118.98, 164.20 and 69.86 is: 96.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.98 : 164.20 = 69.86 : x
  2. Step 2: Convert to fraction form
    118.98/164.20 = 69.86/x
  3. Step 3: Cross multiply
    118.98x = 164.20 × 69.86
  4. Step 4: Simplify right side
    118.98x = 11,471.13
  5. Step 5: Solve for x
    x = 11,471.13/118.98
  6. Step 6: Final answer
    x = 96.41

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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.