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Finding the Fourth Proportional to 119.08, 164.36 and 91.40

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Solution

The fourth proportional to 119.08, 164.36 and 91.40 is: 126.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.08 : 164.36 = 91.40 : x
  2. Step 2: Convert to fraction form
    119.08/164.36 = 91.40/x
  3. Step 3: Cross multiply
    119.08x = 164.36 × 91.40
  4. Step 4: Simplify right side
    119.08x = 15,022.50
  5. Step 5: Solve for x
    x = 15,022.50/119.08
  6. Step 6: Final answer
    x = 126.15

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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.