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Finding the Fourth Proportional to 564.39, 778.82 and 331.47

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Solution

The fourth proportional to 564.39, 778.82 and 331.47 is: 457.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.39 : 778.82 = 331.47 : x
  2. Step 2: Convert to fraction form
    564.39/778.82 = 331.47/x
  3. Step 3: Cross multiply
    564.39x = 778.82 × 331.47
  4. Step 4: Simplify right side
    564.39x = 258,153.81
  5. Step 5: Solve for x
    x = 258,153.81/564.39
  6. Step 6: Final answer
    x = 457.40

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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.