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Finding the Fourth Proportional to 449.78, 674.72 and 141.64

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Solution

The fourth proportional to 449.78, 674.72 and 141.64 is: 212.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.78 : 674.72 = 141.64 : x
  2. Step 2: Convert to fraction form
    449.78/674.72 = 141.64/x
  3. Step 3: Cross multiply
    449.78x = 674.72 × 141.64
  4. Step 4: Simplify right side
    449.78x = 95,567.34
  5. Step 5: Solve for x
    x = 95,567.34/449.78
  6. Step 6: Final answer
    x = 212.48

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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.