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Finding the Fourth Proportional to 647.86, 893.91 and 385.96

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Solution

The fourth proportional to 647.86, 893.91 and 385.96 is: 532.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.86 : 893.91 = 385.96 : x
  2. Step 2: Convert to fraction form
    647.86/893.91 = 385.96/x
  3. Step 3: Cross multiply
    647.86x = 893.91 × 385.96
  4. Step 4: Simplify right side
    647.86x = 345,013.50
  5. Step 5: Solve for x
    x = 345,013.50/647.86
  6. Step 6: Final answer
    x = 532.54

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