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Finding the Fourth Proportional to 551.64, 826.55 and 388.99

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Solution

The fourth proportional to 551.64, 826.55 and 388.99 is: 582.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.64 : 826.55 = 388.99 : x
  2. Step 2: Convert to fraction form
    551.64/826.55 = 388.99/x
  3. Step 3: Cross multiply
    551.64x = 826.55 × 388.99
  4. Step 4: Simplify right side
    551.64x = 321,517.77
  5. Step 5: Solve for x
    x = 321,517.77/551.64
  6. Step 6: Final answer
    x = 582.84

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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.