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Finding the Fourth Proportional to 449.88, 674.34 and 189.72

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Solution

The fourth proportional to 449.88, 674.34 and 189.72 is: 284.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.88 : 674.34 = 189.72 : x
  2. Step 2: Convert to fraction form
    449.88/674.34 = 189.72/x
  3. Step 3: Cross multiply
    449.88x = 674.34 × 189.72
  4. Step 4: Simplify right side
    449.88x = 127,935.78
  5. Step 5: Solve for x
    x = 127,935.78/449.88
  6. Step 6: Final answer
    x = 284.38

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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.