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Finding the Fourth Proportional to 554.23, 764.90 and 321.34

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Solution

The fourth proportional to 554.23, 764.90 and 321.34 is: 443.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.23 : 764.90 = 321.34 : x
  2. Step 2: Convert to fraction form
    554.23/764.90 = 321.34/x
  3. Step 3: Cross multiply
    554.23x = 764.90 × 321.34
  4. Step 4: Simplify right side
    554.23x = 245,791.36
  5. Step 5: Solve for x
    x = 245,791.36/554.23
  6. Step 6: Final answer
    x = 443.48

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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.