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Finding the Fourth Proportional to 193.55, 290.31 and 90.81

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Solution

The fourth proportional to 193.55, 290.31 and 90.81 is: 136.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.55 : 290.31 = 90.81 : x
  2. Step 2: Convert to fraction form
    193.55/290.31 = 90.81/x
  3. Step 3: Cross multiply
    193.55x = 290.31 × 90.81
  4. Step 4: Simplify right side
    193.55x = 26,363.05
  5. Step 5: Solve for x
    x = 26,363.05/193.55
  6. Step 6: Final answer
    x = 136.21

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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.