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Finding the Fourth Proportional to 908.39, 1,361.63 and 388.64

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Solution

The fourth proportional to 908.39, 1,361.63 and 388.64 is: 582.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.39 : 1,361.63 = 388.64 : x
  2. Step 2: Convert to fraction form
    908.39/1,361.63 = 388.64/x
  3. Step 3: Cross multiply
    908.39x = 1,361.63 × 388.64
  4. Step 4: Simplify right side
    908.39x = 529,175.13
  5. Step 5: Solve for x
    x = 529,175.13/908.39
  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.