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Finding the Fourth Proportional to 193.90, 290.80 and 91.23

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Solution

The fourth proportional to 193.90, 290.80 and 91.23 is: 136.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.90 : 290.80 = 91.23 : x
  2. Step 2: Convert to fraction form
    193.90/290.80 = 91.23/x
  3. Step 3: Cross multiply
    193.90x = 290.80 × 91.23
  4. Step 4: Simplify right side
    193.90x = 26,528.23
  5. Step 5: Solve for x
    x = 26,528.23/193.90
  6. Step 6: Final answer
    x = 136.82

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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.