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Finding the Fourth Proportional to 194.35, 268.05 and 128.92

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Solution

The fourth proportional to 194.35, 268.05 and 128.92 is: 177.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.35 : 268.05 = 128.92 : x
  2. Step 2: Convert to fraction form
    194.35/268.05 = 128.92/x
  3. Step 3: Cross multiply
    194.35x = 268.05 × 128.92
  4. Step 4: Simplify right side
    194.35x = 34,557.01
  5. Step 5: Solve for x
    x = 34,557.01/194.35
  6. Step 6: Final answer
    x = 177.81

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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.