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Finding the Fourth Proportional to 398, 549.36 and 260

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Solution

The fourth proportional to 398, 549.36 and 260 is: 358.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    398 : 549.36 = 260 : x
  2. Step 2: Convert to fraction form
    398/549.36 = 260/x
  3. Step 3: Cross multiply
    398x = 549.36 × 260
  4. Step 4: Simplify right side
    398x = 142,833.60
  5. Step 5: Solve for x
    x = 142,833.60/398
  6. Step 6: Final answer
    x = 358.88

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