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Finding the Fourth Proportional to 449.28, 674.08 and 278.40

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Solution

The fourth proportional to 449.28, 674.08 and 278.40 is: 417.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.28 : 674.08 = 278.40 : x
  2. Step 2: Convert to fraction form
    449.28/674.08 = 278.40/x
  3. Step 3: Cross multiply
    449.28x = 674.08 × 278.40
  4. Step 4: Simplify right side
    449.28x = 187,663.87
  5. Step 5: Solve for x
    x = 187,663.87/449.28
  6. Step 6: Final answer
    x = 417.70

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