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Finding the Fourth Proportional to 118.90, 164.02 and 72.29

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Solution

The fourth proportional to 118.90, 164.02 and 72.29 is: 99.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.90 : 164.02 = 72.29 : x
  2. Step 2: Convert to fraction form
    118.90/164.02 = 72.29/x
  3. Step 3: Cross multiply
    118.90x = 164.02 × 72.29
  4. Step 4: Simplify right side
    118.90x = 11,857.01
  5. Step 5: Solve for x
    x = 11,857.01/118.90
  6. Step 6: Final answer
    x = 99.72

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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.