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Finding the Fourth Proportional to 393.72, 589.02 and 347.55

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Solution

The fourth proportional to 393.72, 589.02 and 347.55 is: 519.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.72 : 589.02 = 347.55 : x
  2. Step 2: Convert to fraction form
    393.72/589.02 = 347.55/x
  3. Step 3: Cross multiply
    393.72x = 589.02 × 347.55
  4. Step 4: Simplify right side
    393.72x = 204,713.90
  5. Step 5: Solve for x
    x = 204,713.90/393.72
  6. Step 6: Final answer
    x = 519.95

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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.