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Finding the Fourth Proportional to 1,213.89, 1,821.03 and 392.43

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Solution

The fourth proportional to 1,213.89, 1,821.03 and 392.43 is: 588.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.89 : 1,821.03 = 392.43 : x
  2. Step 2: Convert to fraction form
    1,213.89/1,821.03 = 392.43/x
  3. Step 3: Cross multiply
    1,213.89x = 1,821.03 × 392.43
  4. Step 4: Simplify right side
    1,213.89x = 714,626.80
  5. Step 5: Solve for x
    x = 714,626.80/1,213.89
  6. Step 6: Final answer
    x = 588.71

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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.