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Finding the Fourth Proportional to 378.98, 567.78 and 324.30

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Solution

The fourth proportional to 378.98, 567.78 and 324.30 is: 485.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.98 : 567.78 = 324.30 : x
  2. Step 2: Convert to fraction form
    378.98/567.78 = 324.30/x
  3. Step 3: Cross multiply
    378.98x = 567.78 × 324.30
  4. Step 4: Simplify right side
    378.98x = 184,131.05
  5. Step 5: Solve for x
    x = 184,131.05/378.98
  6. Step 6: Final answer
    x = 485.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.