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Finding the Fourth Proportional to 905.10, 1,357.89 and 418.38

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Solution

The fourth proportional to 905.10, 1,357.89 and 418.38 is: 627.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.10 : 1,357.89 = 418.38 : x
  2. Step 2: Convert to fraction form
    905.10/1,357.89 = 418.38/x
  3. Step 3: Cross multiply
    905.10x = 1,357.89 × 418.38
  4. Step 4: Simplify right side
    905.10x = 568,114.02
  5. Step 5: Solve for x
    x = 568,114.02/905.10
  6. Step 6: Final answer
    x = 627.68

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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.