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Finding the Fourth Proportional to 393.85, 589.97 and 316.39

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Solution

The fourth proportional to 393.85, 589.97 and 316.39 is: 473.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.85 : 589.97 = 316.39 : x
  2. Step 2: Convert to fraction form
    393.85/589.97 = 316.39/x
  3. Step 3: Cross multiply
    393.85x = 589.97 × 316.39
  4. Step 4: Simplify right side
    393.85x = 186,660.61
  5. Step 5: Solve for x
    x = 186,660.61/393.85
  6. Step 6: Final answer
    x = 473.94

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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.