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Finding the Fourth Proportional to 456.21, 628.08 and 394.86

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Solution

The fourth proportional to 456.21, 628.08 and 394.86 is: 543.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.21 : 628.08 = 394.86 : x
  2. Step 2: Convert to fraction form
    456.21/628.08 = 394.86/x
  3. Step 3: Cross multiply
    456.21x = 628.08 × 394.86
  4. Step 4: Simplify right side
    456.21x = 248,003.67
  5. Step 5: Solve for x
    x = 248,003.67/456.21
  6. Step 6: Final answer
    x = 543.62

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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.