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Finding the Fourth Proportional to 456.27, 628.91 and 308.64

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Solution

The fourth proportional to 456.27, 628.91 and 308.64 is: 425.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.27 : 628.91 = 308.64 : x
  2. Step 2: Convert to fraction form
    456.27/628.91 = 308.64/x
  3. Step 3: Cross multiply
    456.27x = 628.91 × 308.64
  4. Step 4: Simplify right side
    456.27x = 194,105.24
  5. Step 5: Solve for x
    x = 194,105.24/456.27
  6. Step 6: Final answer
    x = 425.42

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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.