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Finding the Fourth Proportional to 392.90, 589.48 and 219.74

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Solution

The fourth proportional to 392.90, 589.48 and 219.74 is: 329.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.90 : 589.48 = 219.74 : x
  2. Step 2: Convert to fraction form
    392.90/589.48 = 219.74/x
  3. Step 3: Cross multiply
    392.90x = 589.48 × 219.74
  4. Step 4: Simplify right side
    392.90x = 129,528.84
  5. Step 5: Solve for x
    x = 129,528.84/392.90
  6. Step 6: Final answer
    x = 329.68

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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.