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Finding the Fourth Proportional to 455.39, 682.20 and 238.45

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Solution

The fourth proportional to 455.39, 682.20 and 238.45 is: 357.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.39 : 682.20 = 238.45 : x
  2. Step 2: Convert to fraction form
    455.39/682.20 = 238.45/x
  3. Step 3: Cross multiply
    455.39x = 682.20 × 238.45
  4. Step 4: Simplify right side
    455.39x = 162,670.59
  5. Step 5: Solve for x
    x = 162,670.59/455.39
  6. Step 6: Final answer
    x = 357.21

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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.