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Finding the Fourth Proportional to 612.36, 843.21 and 573.21

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Solution

The fourth proportional to 612.36, 843.21 and 573.21 is: 789.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.36 : 843.21 = 573.21 : x
  2. Step 2: Convert to fraction form
    612.36/843.21 = 573.21/x
  3. Step 3: Cross multiply
    612.36x = 843.21 × 573.21
  4. Step 4: Simplify right side
    612.36x = 483,336.40
  5. Step 5: Solve for x
    x = 483,336.40/612.36
  6. Step 6: Final answer
    x = 789.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.