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Finding the Fourth Proportional to 119.41, 164.77 and 72.78

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Solution

The fourth proportional to 119.41, 164.77 and 72.78 is: 100.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.41 : 164.77 = 72.78 : x
  2. Step 2: Convert to fraction form
    119.41/164.77 = 72.78/x
  3. Step 3: Cross multiply
    119.41x = 164.77 × 72.78
  4. Step 4: Simplify right side
    119.41x = 11,991.96
  5. Step 5: Solve for x
    x = 11,991.96/119.41
  6. Step 6: Final answer
    x = 100.43

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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.