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Finding the Fourth Proportional to 194.34, 268.15 and 128.80

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Solution

The fourth proportional to 194.34, 268.15 and 128.80 is: 177.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.34 : 268.15 = 128.80 : x
  2. Step 2: Convert to fraction form
    194.34/268.15 = 128.80/x
  3. Step 3: Cross multiply
    194.34x = 268.15 × 128.80
  4. Step 4: Simplify right side
    194.34x = 34,537.72
  5. Step 5: Solve for x
    x = 34,537.72/194.34
  6. Step 6: Final answer
    x = 177.72

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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.