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Finding the Fourth Proportional to 515.88, 774 and 455.40

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Solution

The fourth proportional to 515.88, 774 and 455.40 is: 683.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.88 : 774 = 455.40 : x
  2. Step 2: Convert to fraction form
    515.88/774 = 455.40/x
  3. Step 3: Cross multiply
    515.88x = 774 × 455.40
  4. Step 4: Simplify right side
    515.88x = 352,479.60
  5. Step 5: Solve for x
    x = 352,479.60/515.88
  6. Step 6: Final answer
    x = 683.26

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