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Finding the Fourth Proportional to 392.61, 589 and 386.08

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Solution

The fourth proportional to 392.61, 589 and 386.08 is: 579.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.61 : 589 = 386.08 : x
  2. Step 2: Convert to fraction form
    392.61/589 = 386.08/x
  3. Step 3: Cross multiply
    392.61x = 589 × 386.08
  4. Step 4: Simplify right side
    392.61x = 227,398.18
  5. Step 5: Solve for x
    x = 227,398.18/392.61
  6. Step 6: Final answer
    x = 579.20

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