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Finding the Fourth Proportional to 1,355.69, 2,033.31 and 381.56

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Solution

The fourth proportional to 1,355.69, 2,033.31 and 381.56 is: 572.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.69 : 2,033.31 = 381.56 : x
  2. Step 2: Convert to fraction form
    1,355.69/2,033.31 = 381.56/x
  3. Step 3: Cross multiply
    1,355.69x = 2,033.31 × 381.56
  4. Step 4: Simplify right side
    1,355.69x = 775,833.42
  5. Step 5: Solve for x
    x = 775,833.42/1,355.69
  6. Step 6: Final answer
    x = 572.28

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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.