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Finding the Fourth Proportional to 404.85, 606.45 and 212.07

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Solution

The fourth proportional to 404.85, 606.45 and 212.07 is: 317.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.85 : 606.45 = 212.07 : x
  2. Step 2: Convert to fraction form
    404.85/606.45 = 212.07/x
  3. Step 3: Cross multiply
    404.85x = 606.45 × 212.07
  4. Step 4: Simplify right side
    404.85x = 128,609.85
  5. Step 5: Solve for x
    x = 128,609.85/404.85
  6. Step 6: Final answer
    x = 317.67

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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.