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Finding the Fourth Proportional to 193.41, 289.40 and 142.20

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Solution

The fourth proportional to 193.41, 289.40 and 142.20 is: 212.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.41 : 289.40 = 142.20 : x
  2. Step 2: Convert to fraction form
    193.41/289.40 = 142.20/x
  3. Step 3: Cross multiply
    193.41x = 289.40 × 142.20
  4. Step 4: Simplify right side
    193.41x = 41,151.97
  5. Step 5: Solve for x
    x = 41,151.97/193.41
  6. Step 6: Final answer
    x = 212.77

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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.