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Finding the Fourth Proportional to 557.20, 768.90 and 321.16

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Solution

The fourth proportional to 557.20, 768.90 and 321.16 is: 443.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.20 : 768.90 = 321.16 : x
  2. Step 2: Convert to fraction form
    557.20/768.90 = 321.16/x
  3. Step 3: Cross multiply
    557.20x = 768.90 × 321.16
  4. Step 4: Simplify right side
    557.20x = 246,939.92
  5. Step 5: Solve for x
    x = 246,939.92/557.20
  6. Step 6: Final answer
    x = 443.18

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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.