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Finding the Fourth Proportional to 193.20, 266.56 and 138.08

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Solution

The fourth proportional to 193.20, 266.56 and 138.08 is: 190.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.20 : 266.56 = 138.08 : x
  2. Step 2: Convert to fraction form
    193.20/266.56 = 138.08/x
  3. Step 3: Cross multiply
    193.20x = 266.56 × 138.08
  4. Step 4: Simplify right side
    193.20x = 36,806.60
  5. Step 5: Solve for x
    x = 36,806.60/193.20
  6. Step 6: Final answer
    x = 190.51

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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.