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Finding the Fourth Proportional to 612.56, 919.15 and 324

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Solution

The fourth proportional to 612.56, 919.15 and 324 is: 486.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.56 : 919.15 = 324 : x
  2. Step 2: Convert to fraction form
    612.56/919.15 = 324/x
  3. Step 3: Cross multiply
    612.56x = 919.15 × 324
  4. Step 4: Simplify right side
    612.56x = 297,803.79
  5. Step 5: Solve for x
    x = 297,803.79/612.56
  6. Step 6: Final answer
    x = 486.16

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