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Finding the Fourth Proportional to 193.98, 290.87 and 91.21

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Solution

The fourth proportional to 193.98, 290.87 and 91.21 is: 136.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.98 : 290.87 = 91.21 : x
  2. Step 2: Convert to fraction form
    193.98/290.87 = 91.21/x
  3. Step 3: Cross multiply
    193.98x = 290.87 × 91.21
  4. Step 4: Simplify right side
    193.98x = 26,530.25
  5. Step 5: Solve for x
    x = 26,530.25/193.98
  6. Step 6: Final answer
    x = 136.77

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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.