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Finding the Fourth Proportional to 936.56, 1,405.05 and 381.41

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Solution

The fourth proportional to 936.56, 1,405.05 and 381.41 is: 572.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.56 : 1,405.05 = 381.41 : x
  2. Step 2: Convert to fraction form
    936.56/1,405.05 = 381.41/x
  3. Step 3: Cross multiply
    936.56x = 1,405.05 × 381.41
  4. Step 4: Simplify right side
    936.56x = 535,896.93
  5. Step 5: Solve for x
    x = 535,896.93/936.56
  6. Step 6: Final answer
    x = 572.20

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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.