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Finding the Fourth Proportional to 554.22, 764.61 and 321.30

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Solution

The fourth proportional to 554.22, 764.61 and 321.30 is: 443.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.22 : 764.61 = 321.30 : x
  2. Step 2: Convert to fraction form
    554.22/764.61 = 321.30/x
  3. Step 3: Cross multiply
    554.22x = 764.61 × 321.30
  4. Step 4: Simplify right side
    554.22x = 245,669.19
  5. Step 5: Solve for x
    x = 245,669.19/554.22
  6. Step 6: Final answer
    x = 443.27

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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.