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Finding the Fourth Proportional to 386.55, 578.45 and 283.58

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Solution

The fourth proportional to 386.55, 578.45 and 283.58 is: 424.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.55 : 578.45 = 283.58 : x
  2. Step 2: Convert to fraction form
    386.55/578.45 = 283.58/x
  3. Step 3: Cross multiply
    386.55x = 578.45 × 283.58
  4. Step 4: Simplify right side
    386.55x = 164,036.85
  5. Step 5: Solve for x
    x = 164,036.85/386.55
  6. Step 6: Final answer
    x = 424.36

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