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Finding the Fourth Proportional to 355.02, 488.73 and 305.61

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Solution

The fourth proportional to 355.02, 488.73 and 305.61 is: 420.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.02 : 488.73 = 305.61 : x
  2. Step 2: Convert to fraction form
    355.02/488.73 = 305.61/x
  3. Step 3: Cross multiply
    355.02x = 488.73 × 305.61
  4. Step 4: Simplify right side
    355.02x = 149,360.78
  5. Step 5: Solve for x
    x = 149,360.78/355.02
  6. Step 6: Final answer
    x = 420.71

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