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Finding the Fourth Proportional to 193.20, 290.10 and 112.20

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Solution

The fourth proportional to 193.20, 290.10 and 112.20 is: 168.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.20 : 290.10 = 112.20 : x
  2. Step 2: Convert to fraction form
    193.20/290.10 = 112.20/x
  3. Step 3: Cross multiply
    193.20x = 290.10 × 112.20
  4. Step 4: Simplify right side
    193.20x = 32,549.22
  5. Step 5: Solve for x
    x = 32,549.22/193.20
  6. Step 6: Final answer
    x = 168.47

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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.