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Finding the Fourth Proportional to 299.74, 412.72 and 255.40

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Solution

The fourth proportional to 299.74, 412.72 and 255.40 is: 351.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.74 : 412.72 = 255.40 : x
  2. Step 2: Convert to fraction form
    299.74/412.72 = 255.40/x
  3. Step 3: Cross multiply
    299.74x = 412.72 × 255.40
  4. Step 4: Simplify right side
    299.74x = 105,408.69
  5. Step 5: Solve for x
    x = 105,408.69/299.74
  6. Step 6: Final answer
    x = 351.67

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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.