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Finding the Fourth Proportional to 652.89, 978.66 and 408.86

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Solution

The fourth proportional to 652.89, 978.66 and 408.86 is: 612.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.89 : 978.66 = 408.86 : x
  2. Step 2: Convert to fraction form
    652.89/978.66 = 408.86/x
  3. Step 3: Cross multiply
    652.89x = 978.66 × 408.86
  4. Step 4: Simplify right side
    652.89x = 400,130.03
  5. Step 5: Solve for x
    x = 400,130.03/652.89
  6. Step 6: Final answer
    x = 612.86

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