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Finding the Fourth Proportional to 551.90, 826.94 and 388.79

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Solution

The fourth proportional to 551.90, 826.94 and 388.79 is: 582.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.90 : 826.94 = 388.79 : x
  2. Step 2: Convert to fraction form
    551.90/826.94 = 388.79/x
  3. Step 3: Cross multiply
    551.90x = 826.94 × 388.79
  4. Step 4: Simplify right side
    551.90x = 321,499.92
  5. Step 5: Solve for x
    x = 321,499.92/551.90
  6. Step 6: Final answer
    x = 582.54

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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.