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Finding the Fourth Proportional to 280.43, 387.16 and 249.67

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Solution

The fourth proportional to 280.43, 387.16 and 249.67 is: 344.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.43 : 387.16 = 249.67 : x
  2. Step 2: Convert to fraction form
    280.43/387.16 = 249.67/x
  3. Step 3: Cross multiply
    280.43x = 387.16 × 249.67
  4. Step 4: Simplify right side
    280.43x = 96,662.24
  5. Step 5: Solve for x
    x = 96,662.24/280.43
  6. Step 6: Final answer
    x = 344.69

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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.