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Finding the Fourth Proportional to 663.05, 993.21 and 388.31

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Solution

The fourth proportional to 663.05, 993.21 and 388.31 is: 581.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.05 : 993.21 = 388.31 : x
  2. Step 2: Convert to fraction form
    663.05/993.21 = 388.31/x
  3. Step 3: Cross multiply
    663.05x = 993.21 × 388.31
  4. Step 4: Simplify right side
    663.05x = 385,674.72
  5. Step 5: Solve for x
    x = 385,674.72/663.05
  6. Step 6: Final answer
    x = 581.67

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