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Finding the Fourth Proportional to 936.81, 1,405.21 and 287.54

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Solution

The fourth proportional to 936.81, 1,405.21 and 287.54 is: 431.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.81 : 1,405.21 = 287.54 : x
  2. Step 2: Convert to fraction form
    936.81/1,405.21 = 287.54/x
  3. Step 3: Cross multiply
    936.81x = 1,405.21 × 287.54
  4. Step 4: Simplify right side
    936.81x = 404,047.06
  5. Step 5: Solve for x
    x = 404,047.06/936.81
  6. Step 6: Final answer
    x = 431.30

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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.