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Finding the Fourth Proportional to 905.11, 1,356.94 and 391.75

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Solution

The fourth proportional to 905.11, 1,356.94 and 391.75 is: 587.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.11 : 1,356.94 = 391.75 : x
  2. Step 2: Convert to fraction form
    905.11/1,356.94 = 391.75/x
  3. Step 3: Cross multiply
    905.11x = 1,356.94 × 391.75
  4. Step 4: Simplify right side
    905.11x = 531,581.25
  5. Step 5: Solve for x
    x = 531,581.25/905.11
  6. Step 6: Final answer
    x = 587.31

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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.