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Finding the Fourth Proportional to 1,268.65, 1,902.67 and 857.68

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Solution

The fourth proportional to 1,268.65, 1,902.67 and 857.68 is: 1,286.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.65 : 1,902.67 = 857.68 : x
  2. Step 2: Convert to fraction form
    1,268.65/1,902.67 = 857.68/x
  3. Step 3: Cross multiply
    1,268.65x = 1,902.67 × 857.68
  4. Step 4: Simplify right side
    1,268.65x = 1,631,882.01
  5. Step 5: Solve for x
    x = 1,631,882.01/1,268.65
  6. Step 6: Final answer
    x = 1,286.31

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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.