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Finding the Fourth Proportional to 280.30, 386.79 and 163.87

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Solution

The fourth proportional to 280.30, 386.79 and 163.87 is: 226.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.30 : 386.79 = 163.87 : x
  2. Step 2: Convert to fraction form
    280.30/386.79 = 163.87/x
  3. Step 3: Cross multiply
    280.30x = 386.79 × 163.87
  4. Step 4: Simplify right side
    280.30x = 63,383.28
  5. Step 5: Solve for x
    x = 63,383.28/280.30
  6. Step 6: Final answer
    x = 226.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.