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Finding the Fourth Proportional to 1,305.56, 1,958.28 and 381.08

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Solution

The fourth proportional to 1,305.56, 1,958.28 and 381.08 is: 571.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.56 : 1,958.28 = 381.08 : x
  2. Step 2: Convert to fraction form
    1,305.56/1,958.28 = 381.08/x
  3. Step 3: Cross multiply
    1,305.56x = 1,958.28 × 381.08
  4. Step 4: Simplify right side
    1,305.56x = 746,261.34
  5. Step 5: Solve for x
    x = 746,261.34/1,305.56
  6. Step 6: Final answer
    x = 571.60

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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.