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Finding the Fourth Proportional to 905.94, 1,358.46 and 418.74

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Solution

The fourth proportional to 905.94, 1,358.46 and 418.74 is: 627.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.94 : 1,358.46 = 418.74 : x
  2. Step 2: Convert to fraction form
    905.94/1,358.46 = 418.74/x
  3. Step 3: Cross multiply
    905.94x = 1,358.46 × 418.74
  4. Step 4: Simplify right side
    905.94x = 568,841.54
  5. Step 5: Solve for x
    x = 568,841.54/905.94
  6. Step 6: Final answer
    x = 627.90

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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.