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Finding the Fourth Proportional to 393.27, 589.99 and 197.78

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Solution

The fourth proportional to 393.27, 589.99 and 197.78 is: 296.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.27 : 589.99 = 197.78 : x
  2. Step 2: Convert to fraction form
    393.27/589.99 = 197.78/x
  3. Step 3: Cross multiply
    393.27x = 589.99 × 197.78
  4. Step 4: Simplify right side
    393.27x = 116,688.22
  5. Step 5: Solve for x
    x = 116,688.22/393.27
  6. Step 6: Final answer
    x = 296.71

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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.