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Finding the Fourth Proportional to 905.87, 1,358.78 and 418.92

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Solution

The fourth proportional to 905.87, 1,358.78 and 418.92 is: 628.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.87 : 1,358.78 = 418.92 : x
  2. Step 2: Convert to fraction form
    905.87/1,358.78 = 418.92/x
  3. Step 3: Cross multiply
    905.87x = 1,358.78 × 418.92
  4. Step 4: Simplify right side
    905.87x = 569,220.12
  5. Step 5: Solve for x
    x = 569,220.12/905.87
  6. Step 6: Final answer
    x = 628.37

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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.