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Finding the Fourth Proportional to 119.36, 164.72 and 91.71

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Solution

The fourth proportional to 119.36, 164.72 and 91.71 is: 126.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.36 : 164.72 = 91.71 : x
  2. Step 2: Convert to fraction form
    119.36/164.72 = 91.71/x
  3. Step 3: Cross multiply
    119.36x = 164.72 × 91.71
  4. Step 4: Simplify right side
    119.36x = 15,106.70
  5. Step 5: Solve for x
    x = 15,106.70/119.36
  6. Step 6: Final answer
    x = 126.57

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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.