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Finding the Fourth Proportional to 118.98, 164.10 and 72.36

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Solution

The fourth proportional to 118.98, 164.10 and 72.36 is: 99.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.98 : 164.10 = 72.36 : x
  2. Step 2: Convert to fraction form
    118.98/164.10 = 72.36/x
  3. Step 3: Cross multiply
    118.98x = 164.10 × 72.36
  4. Step 4: Simplify right side
    118.98x = 11,874.28
  5. Step 5: Solve for x
    x = 11,874.28/118.98
  6. Step 6: Final answer
    x = 99.80

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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.