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Finding the Fourth Proportional to 118.98, 164.21 and 74.75

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Solution

The fourth proportional to 118.98, 164.21 and 74.75 is: 103.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.98 : 164.21 = 74.75 : x
  2. Step 2: Convert to fraction form
    118.98/164.21 = 74.75/x
  3. Step 3: Cross multiply
    118.98x = 164.21 × 74.75
  4. Step 4: Simplify right side
    118.98x = 12,274.06
  5. Step 5: Solve for x
    x = 12,274.06/118.98
  6. Step 6: Final answer
    x = 103.16

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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.