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Finding the Fourth Proportional to 444.20, 664.67 and 390.74

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Solution

The fourth proportional to 444.20, 664.67 and 390.74 is: 584.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.20 : 664.67 = 390.74 : x
  2. Step 2: Convert to fraction form
    444.20/664.67 = 390.74/x
  3. Step 3: Cross multiply
    444.20x = 664.67 × 390.74
  4. Step 4: Simplify right side
    444.20x = 259,707.88
  5. Step 5: Solve for x
    x = 259,707.88/444.20
  6. Step 6: Final answer
    x = 584.67

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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.