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Finding the Fourth Proportional to 449.63, 620.21 and 283.56

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Solution

The fourth proportional to 449.63, 620.21 and 283.56 is: 391.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.63 : 620.21 = 283.56 : x
  2. Step 2: Convert to fraction form
    449.63/620.21 = 283.56/x
  3. Step 3: Cross multiply
    449.63x = 620.21 × 283.56
  4. Step 4: Simplify right side
    449.63x = 175,866.75
  5. Step 5: Solve for x
    x = 175,866.75/449.63
  6. Step 6: Final answer
    x = 391.14

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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.