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Finding the Fourth Proportional to 280.21, 386.62 and 169.69

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Solution

The fourth proportional to 280.21, 386.62 and 169.69 is: 234.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.21 : 386.62 = 169.69 : x
  2. Step 2: Convert to fraction form
    280.21/386.62 = 169.69/x
  3. Step 3: Cross multiply
    280.21x = 386.62 × 169.69
  4. Step 4: Simplify right side
    280.21x = 65,605.55
  5. Step 5: Solve for x
    x = 65,605.55/280.21
  6. Step 6: Final answer
    x = 234.13

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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.