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Finding the Fourth Proportional to 1,285.25, 1,927.97 and 515.75

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Solution

The fourth proportional to 1,285.25, 1,927.97 and 515.75 is: 773.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.25 : 1,927.97 = 515.75 : x
  2. Step 2: Convert to fraction form
    1,285.25/1,927.97 = 515.75/x
  3. Step 3: Cross multiply
    1,285.25x = 1,927.97 × 515.75
  4. Step 4: Simplify right side
    1,285.25x = 994,347.95
  5. Step 5: Solve for x
    x = 994,347.95/1,285.25
  6. Step 6: Final answer
    x = 773.66

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