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Finding the Fourth Proportional to 557.21, 768.98 and 321.08

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Solution

The fourth proportional to 557.21, 768.98 and 321.08 is: 443.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.21 : 768.98 = 321.08 : x
  2. Step 2: Convert to fraction form
    557.21/768.98 = 321.08/x
  3. Step 3: Cross multiply
    557.21x = 768.98 × 321.08
  4. Step 4: Simplify right side
    557.21x = 246,901.06
  5. Step 5: Solve for x
    x = 246,901.06/557.21
  6. Step 6: Final answer
    x = 443.10

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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.