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Finding the Fourth Proportional to 258.90, 387.97 and 193.60

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Solution

The fourth proportional to 258.90, 387.97 and 193.60 is: 290.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.90 : 387.97 = 193.60 : x
  2. Step 2: Convert to fraction form
    258.90/387.97 = 193.60/x
  3. Step 3: Cross multiply
    258.90x = 387.97 × 193.60
  4. Step 4: Simplify right side
    258.90x = 75,109.29
  5. Step 5: Solve for x
    x = 75,109.29/258.90
  6. Step 6: Final answer
    x = 290.11

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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.