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Finding the Fourth Proportional to 905.09, 1,357.81 and 411.54

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Solution

The fourth proportional to 905.09, 1,357.81 and 411.54 is: 617.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.09 : 1,357.81 = 411.54 : x
  2. Step 2: Convert to fraction form
    905.09/1,357.81 = 411.54/x
  3. Step 3: Cross multiply
    905.09x = 1,357.81 × 411.54
  4. Step 4: Simplify right side
    905.09x = 558,785.31
  5. Step 5: Solve for x
    x = 558,785.31/905.09
  6. Step 6: Final answer
    x = 617.38

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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.