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Finding the Fourth Proportional to 280.75, 387.30 and 225.56

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Solution

The fourth proportional to 280.75, 387.30 and 225.56 is: 311.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.75 : 387.30 = 225.56 : x
  2. Step 2: Convert to fraction form
    280.75/387.30 = 225.56/x
  3. Step 3: Cross multiply
    280.75x = 387.30 × 225.56
  4. Step 4: Simplify right side
    280.75x = 87,359.39
  5. Step 5: Solve for x
    x = 87,359.39/280.75
  6. Step 6: Final answer
    x = 311.16

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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.