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Finding the Fourth Proportional to 554.48, 765 and 321.44

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Solution

The fourth proportional to 554.48, 765 and 321.44 is: 443.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.48 : 765 = 321.44 : x
  2. Step 2: Convert to fraction form
    554.48/765 = 321.44/x
  3. Step 3: Cross multiply
    554.48x = 765 × 321.44
  4. Step 4: Simplify right side
    554.48x = 245,901.60
  5. Step 5: Solve for x
    x = 245,901.60/554.48
  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.