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Finding the Fourth Proportional to 1,286.00, 1,928.71 and 361.65

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Solution

The fourth proportional to 1,286.00, 1,928.71 and 361.65 is: 542.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.00 : 1,928.71 = 361.65 : x
  2. Step 2: Convert to fraction form
    1,286.00/1,928.71 = 361.65/x
  3. Step 3: Cross multiply
    1,286.00x = 1,928.71 × 361.65
  4. Step 4: Simplify right side
    1,286.00x = 697,517.07
  5. Step 5: Solve for x
    x = 697,517.07/1,286.00
  6. Step 6: Final answer
    x = 542.39

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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.