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Finding the Fourth Proportional to 119.01, 164.21 and 72.39

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Solution

The fourth proportional to 119.01, 164.21 and 72.39 is: 99.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.01 : 164.21 = 72.39 : x
  2. Step 2: Convert to fraction form
    119.01/164.21 = 72.39/x
  3. Step 3: Cross multiply
    119.01x = 164.21 × 72.39
  4. Step 4: Simplify right side
    119.01x = 11,886.80
  5. Step 5: Solve for x
    x = 11,886.80/119.01
  6. Step 6: Final answer
    x = 99.88

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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.