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Finding the Fourth Proportional to 936.70, 1,405.15 and 443.07

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Solution

The fourth proportional to 936.70, 1,405.15 and 443.07 is: 664.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.70 : 1,405.15 = 443.07 : x
  2. Step 2: Convert to fraction form
    936.70/1,405.15 = 443.07/x
  3. Step 3: Cross multiply
    936.70x = 1,405.15 × 443.07
  4. Step 4: Simplify right side
    936.70x = 622,578.70
  5. Step 5: Solve for x
    x = 622,578.70/936.70
  6. Step 6: Final answer
    x = 664.65

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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.