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Finding the Fourth Proportional to 905.56, 1,357.87 and 418.95

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Solution

The fourth proportional to 905.56, 1,357.87 and 418.95 is: 628.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.56 : 1,357.87 = 418.95 : x
  2. Step 2: Convert to fraction form
    905.56/1,357.87 = 418.95/x
  3. Step 3: Cross multiply
    905.56x = 1,357.87 × 418.95
  4. Step 4: Simplify right side
    905.56x = 568,881.98
  5. Step 5: Solve for x
    x = 568,881.98/905.56
  6. Step 6: Final answer
    x = 628.21

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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.