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Finding the Fourth Proportional to 392.44, 587.78 and 225.45

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Solution

The fourth proportional to 392.44, 587.78 and 225.45 is: 337.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.44 : 587.78 = 225.45 : x
  2. Step 2: Convert to fraction form
    392.44/587.78 = 225.45/x
  3. Step 3: Cross multiply
    392.44x = 587.78 × 225.45
  4. Step 4: Simplify right side
    392.44x = 132,513.87
  5. Step 5: Solve for x
    x = 132,513.87/392.44
  6. Step 6: Final answer
    x = 337.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.