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Finding the Fourth Proportional to 667.50, 921.29 and 387.80

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Solution

The fourth proportional to 667.50, 921.29 and 387.80 is: 535.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.50 : 921.29 = 387.80 : x
  2. Step 2: Convert to fraction form
    667.50/921.29 = 387.80/x
  3. Step 3: Cross multiply
    667.50x = 921.29 × 387.80
  4. Step 4: Simplify right side
    667.50x = 357,269.72
  5. Step 5: Solve for x
    x = 357,269.72/667.50
  6. Step 6: Final answer
    x = 535.24

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