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Finding the Fourth Proportional to 936.96, 1,405.09 and 320.49

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Solution

The fourth proportional to 936.96, 1,405.09 and 320.49 is: 480.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.96 : 1,405.09 = 320.49 : x
  2. Step 2: Convert to fraction form
    936.96/1,405.09 = 320.49/x
  3. Step 3: Cross multiply
    936.96x = 1,405.09 × 320.49
  4. Step 4: Simplify right side
    936.96x = 450,317.29
  5. Step 5: Solve for x
    x = 450,317.29/936.96
  6. Step 6: Final answer
    x = 480.62

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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.