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Finding the Fourth Proportional to 119.52, 164.79 and 80.64

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Solution

The fourth proportional to 119.52, 164.79 and 80.64 is: 111.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.52 : 164.79 = 80.64 : x
  2. Step 2: Convert to fraction form
    119.52/164.79 = 80.64/x
  3. Step 3: Cross multiply
    119.52x = 164.79 × 80.64
  4. Step 4: Simplify right side
    119.52x = 13,288.67
  5. Step 5: Solve for x
    x = 13,288.67/119.52
  6. Step 6: Final answer
    x = 111.18

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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.