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Finding the Fourth Proportional to 455.56, 682.74 and 319.48

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Solution

The fourth proportional to 455.56, 682.74 and 319.48 is: 478.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.56 : 682.74 = 319.48 : x
  2. Step 2: Convert to fraction form
    455.56/682.74 = 319.48/x
  3. Step 3: Cross multiply
    455.56x = 682.74 × 319.48
  4. Step 4: Simplify right side
    455.56x = 218,121.78
  5. Step 5: Solve for x
    x = 218,121.78/455.56
  6. Step 6: Final answer
    x = 478.80

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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.