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Finding the Fourth Proportional to 465.94, 643 and 256.12

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Solution

The fourth proportional to 465.94, 643 and 256.12 is: 353.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.94 : 643 = 256.12 : x
  2. Step 2: Convert to fraction form
    465.94/643 = 256.12/x
  3. Step 3: Cross multiply
    465.94x = 643 × 256.12
  4. Step 4: Simplify right side
    465.94x = 164,685.16
  5. Step 5: Solve for x
    x = 164,685.16/465.94
  6. Step 6: Final answer
    x = 353.45

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