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Finding the Fourth Proportional to 194.58, 268.64 and 121

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Solution

The fourth proportional to 194.58, 268.64 and 121 is: 167.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.58 : 268.64 = 121 : x
  2. Step 2: Convert to fraction form
    194.58/268.64 = 121/x
  3. Step 3: Cross multiply
    194.58x = 268.64 × 121
  4. Step 4: Simplify right side
    194.58x = 32,505.44
  5. Step 5: Solve for x
    x = 32,505.44/194.58
  6. Step 6: Final answer
    x = 167.05

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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.