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Finding the Fourth Proportional to 1,305.42, 1,958.31 and 381.05

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Solution

The fourth proportional to 1,305.42, 1,958.31 and 381.05 is: 571.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.42 : 1,958.31 = 381.05 : x
  2. Step 2: Convert to fraction form
    1,305.42/1,958.31 = 381.05/x
  3. Step 3: Cross multiply
    1,305.42x = 1,958.31 × 381.05
  4. Step 4: Simplify right side
    1,305.42x = 746,222.59
  5. Step 5: Solve for x
    x = 746,222.59/1,305.42
  6. Step 6: Final answer
    x = 571.64

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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.