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Finding the Fourth Proportional to 557.28, 768.99 and 321.23

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Solution

The fourth proportional to 557.28, 768.99 and 321.23 is: 443.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.28 : 768.99 = 321.23 : x
  2. Step 2: Convert to fraction form
    557.28/768.99 = 321.23/x
  3. Step 3: Cross multiply
    557.28x = 768.99 × 321.23
  4. Step 4: Simplify right side
    557.28x = 247,018.81
  5. Step 5: Solve for x
    x = 247,018.81/557.28
  6. Step 6: Final answer
    x = 443.26

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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.