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Finding the Fourth Proportional to 193.48, 290.39 and 128.68

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Solution

The fourth proportional to 193.48, 290.39 and 128.68 is: 193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.48 : 290.39 = 128.68 : x
  2. Step 2: Convert to fraction form
    193.48/290.39 = 128.68/x
  3. Step 3: Cross multiply
    193.48x = 290.39 × 128.68
  4. Step 4: Simplify right side
    193.48x = 37,367.39
  5. Step 5: Solve for x
    x = 37,367.39/193.48
  6. Step 6: Final answer
    x = 193.13

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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.