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Finding the Fourth Proportional to 193.13, 289.35 and 128.09

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Solution

The fourth proportional to 193.13, 289.35 and 128.09 is: 191.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.13 : 289.35 = 128.09 : x
  2. Step 2: Convert to fraction form
    193.13/289.35 = 128.09/x
  3. Step 3: Cross multiply
    193.13x = 289.35 × 128.09
  4. Step 4: Simplify right side
    193.13x = 37,061.39
  5. Step 5: Solve for x
    x = 37,061.39/193.13
  6. Step 6: Final answer
    x = 191.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.