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Finding the Fourth Proportional to 908.07, 1,361.70 and 388.05

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Solution

The fourth proportional to 908.07, 1,361.70 and 388.05 is: 581.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.07 : 1,361.70 = 388.05 : x
  2. Step 2: Convert to fraction form
    908.07/1,361.70 = 388.05/x
  3. Step 3: Cross multiply
    908.07x = 1,361.70 × 388.05
  4. Step 4: Simplify right side
    908.07x = 528,407.69
  5. Step 5: Solve for x
    x = 528,407.69/908.07
  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.