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Finding the Fourth Proportional to 119.09, 164.20 and 84.06

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Solution

The fourth proportional to 119.09, 164.20 and 84.06 is: 115.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.09 : 164.20 = 84.06 : x
  2. Step 2: Convert to fraction form
    119.09/164.20 = 84.06/x
  3. Step 3: Cross multiply
    119.09x = 164.20 × 84.06
  4. Step 4: Simplify right side
    119.09x = 13,802.77
  5. Step 5: Solve for x
    x = 13,802.77/119.09
  6. Step 6: Final answer
    x = 115.90

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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.