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Finding the Fourth Proportional to 905.09, 1,357.87 and 418.49

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Solution

The fourth proportional to 905.09, 1,357.87 and 418.49 is: 627.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.09 : 1,357.87 = 418.49 : x
  2. Step 2: Convert to fraction form
    905.09/1,357.87 = 418.49/x
  3. Step 3: Cross multiply
    905.09x = 1,357.87 × 418.49
  4. Step 4: Simplify right side
    905.09x = 568,255.02
  5. Step 5: Solve for x
    x = 568,255.02/905.09
  6. Step 6: Final answer
    x = 627.84

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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.