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Finding the Fourth Proportional to 449.40, 620.22 and 283.80

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Solution

The fourth proportional to 449.40, 620.22 and 283.80 is: 391.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.40 : 620.22 = 283.80 : x
  2. Step 2: Convert to fraction form
    449.40/620.22 = 283.80/x
  3. Step 3: Cross multiply
    449.40x = 620.22 × 283.80
  4. Step 4: Simplify right side
    449.40x = 176,018.44
  5. Step 5: Solve for x
    x = 176,018.44/449.40
  6. Step 6: Final answer
    x = 391.67

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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.