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Finding the Fourth Proportional to 908.08, 1,361.27 and 388.13

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Solution

The fourth proportional to 908.08, 1,361.27 and 388.13 is: 581.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.08 : 1,361.27 = 388.13 : x
  2. Step 2: Convert to fraction form
    908.08/1,361.27 = 388.13/x
  3. Step 3: Cross multiply
    908.08x = 1,361.27 × 388.13
  4. Step 4: Simplify right side
    908.08x = 528,343.89
  5. Step 5: Solve for x
    x = 528,343.89/908.08
  6. Step 6: Final answer
    x = 581.83

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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.