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Finding the Fourth Proportional to 392.35, 589.10 and 219.35

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Solution

The fourth proportional to 392.35, 589.10 and 219.35 is: 329.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.35 : 589.10 = 219.35 : x
  2. Step 2: Convert to fraction form
    392.35/589.10 = 219.35/x
  3. Step 3: Cross multiply
    392.35x = 589.10 × 219.35
  4. Step 4: Simplify right side
    392.35x = 129,217.99
  5. Step 5: Solve for x
    x = 129,217.99/392.35
  6. Step 6: Final answer
    x = 329.35

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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.