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Finding the Fourth Proportional to 645.86, 891.15 and 383.96

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Solution

The fourth proportional to 645.86, 891.15 and 383.96 is: 529.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.86 : 891.15 = 383.96 : x
  2. Step 2: Convert to fraction form
    645.86/891.15 = 383.96/x
  3. Step 3: Cross multiply
    645.86x = 891.15 × 383.96
  4. Step 4: Simplify right side
    645.86x = 342,165.95
  5. Step 5: Solve for x
    x = 342,165.95/645.86
  6. Step 6: Final answer
    x = 529.78

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