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Finding the Fourth Proportional to 905.55, 1,358.78 and 418.94

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Solution

The fourth proportional to 905.55, 1,358.78 and 418.94 is: 628.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.55 : 1,358.78 = 418.94 : x
  2. Step 2: Convert to fraction form
    905.55/1,358.78 = 418.94/x
  3. Step 3: Cross multiply
    905.55x = 1,358.78 × 418.94
  4. Step 4: Simplify right side
    905.55x = 569,245.20
  5. Step 5: Solve for x
    x = 569,245.20/905.55
  6. Step 6: Final answer
    x = 628.62

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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.