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Finding the Fourth Proportional to 280.29, 386.90 and 163.95

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Solution

The fourth proportional to 280.29, 386.90 and 163.95 is: 226.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.29 : 386.90 = 163.95 : x
  2. Step 2: Convert to fraction form
    280.29/386.90 = 163.95/x
  3. Step 3: Cross multiply
    280.29x = 386.90 × 163.95
  4. Step 4: Simplify right side
    280.29x = 63,431.44
  5. Step 5: Solve for x
    x = 63,431.44/280.29
  6. Step 6: Final answer
    x = 226.31

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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.