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Finding the Fourth Proportional to 449.66, 674.01 and 287.39

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Solution

The fourth proportional to 449.66, 674.01 and 287.39 is: 430.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.66 : 674.01 = 287.39 : x
  2. Step 2: Convert to fraction form
    449.66/674.01 = 287.39/x
  3. Step 3: Cross multiply
    449.66x = 674.01 × 287.39
  4. Step 4: Simplify right side
    449.66x = 193,700.36
  5. Step 5: Solve for x
    x = 193,700.36/449.66
  6. Step 6: Final answer
    x = 430.78

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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.