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Finding the Fourth Proportional to 193.57, 266.92 and 128.09

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Solution

The fourth proportional to 193.57, 266.92 and 128.09 is: 176.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.57 : 266.92 = 128.09 : x
  2. Step 2: Convert to fraction form
    193.57/266.92 = 128.09/x
  3. Step 3: Cross multiply
    193.57x = 266.92 × 128.09
  4. Step 4: Simplify right side
    193.57x = 34,190.13
  5. Step 5: Solve for x
    x = 34,190.13/193.57
  6. Step 6: Final answer
    x = 176.63

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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.