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Finding the Fourth Proportional to 908.35, 1,361.99 and 388.09

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Solution

The fourth proportional to 908.35, 1,361.99 and 388.09 is: 581.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.35 : 1,361.99 = 388.09 : x
  2. Step 2: Convert to fraction form
    908.35/1,361.99 = 388.09/x
  3. Step 3: Cross multiply
    908.35x = 1,361.99 × 388.09
  4. Step 4: Simplify right side
    908.35x = 528,565.95
  5. Step 5: Solve for x
    x = 528,565.95/908.35
  6. Step 6: Final answer
    x = 581.90

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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.