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Finding the Fourth Proportional to 449.28, 676.31 and 389.75

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Solution

The fourth proportional to 449.28, 676.31 and 389.75 is: 586.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.28 : 676.31 = 389.75 : x
  2. Step 2: Convert to fraction form
    449.28/676.31 = 389.75/x
  3. Step 3: Cross multiply
    449.28x = 676.31 × 389.75
  4. Step 4: Simplify right side
    449.28x = 263,586.49
  5. Step 5: Solve for x
    x = 263,586.49/449.28
  6. Step 6: Final answer
    x = 586.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.