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Finding the Fourth Proportional to 551.25, 826.79 and 388.44

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Solution

The fourth proportional to 551.25, 826.79 and 388.44 is: 582.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.25 : 826.79 = 388.44 : x
  2. Step 2: Convert to fraction form
    551.25/826.79 = 388.44/x
  3. Step 3: Cross multiply
    551.25x = 826.79 × 388.44
  4. Step 4: Simplify right side
    551.25x = 321,156.37
  5. Step 5: Solve for x
    x = 321,156.37/551.25
  6. Step 6: Final answer
    x = 582.60

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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.