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Finding the Fourth Proportional to 564.56, 779.20 and 331.68

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Solution

The fourth proportional to 564.56, 779.20 and 331.68 is: 457.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.56 : 779.20 = 331.68 : x
  2. Step 2: Convert to fraction form
    564.56/779.20 = 331.68/x
  3. Step 3: Cross multiply
    564.56x = 779.20 × 331.68
  4. Step 4: Simplify right side
    564.56x = 258,445.06
  5. Step 5: Solve for x
    x = 258,445.06/564.56
  6. Step 6: Final answer
    x = 457.78

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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.