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Finding the Fourth Proportional to 554.08, 764.64 and 321.16

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Solution

The fourth proportional to 554.08, 764.64 and 321.16 is: 443.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.08 : 764.64 = 321.16 : x
  2. Step 2: Convert to fraction form
    554.08/764.64 = 321.16/x
  3. Step 3: Cross multiply
    554.08x = 764.64 × 321.16
  4. Step 4: Simplify right side
    554.08x = 245,571.78
  5. Step 5: Solve for x
    x = 245,571.78/554.08
  6. Step 6: Final answer
    x = 443.21

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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.