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Finding the Fourth Proportional to 667.88, 920.70 and 518.70

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Solution

The fourth proportional to 667.88, 920.70 and 518.70 is: 715.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.88 : 920.70 = 518.70 : x
  2. Step 2: Convert to fraction form
    667.88/920.70 = 518.70/x
  3. Step 3: Cross multiply
    667.88x = 920.70 × 518.70
  4. Step 4: Simplify right side
    667.88x = 477,567.09
  5. Step 5: Solve for x
    x = 477,567.09/667.88
  6. Step 6: Final answer
    x = 715.05

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