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Finding the Fourth Proportional to 322.75, 445.40 and 206.47

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Solution

The fourth proportional to 322.75, 445.40 and 206.47 is: 284.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.75 : 445.40 = 206.47 : x
  2. Step 2: Convert to fraction form
    322.75/445.40 = 206.47/x
  3. Step 3: Cross multiply
    322.75x = 445.40 × 206.47
  4. Step 4: Simplify right side
    322.75x = 91,961.74
  5. Step 5: Solve for x
    x = 91,961.74/322.75
  6. Step 6: Final answer
    x = 284.93

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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.