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Finding the Fourth Proportional to 378.31, 567.34 and 121.75

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Solution

The fourth proportional to 378.31, 567.34 and 121.75 is: 182.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.31 : 567.34 = 121.75 : x
  2. Step 2: Convert to fraction form
    378.31/567.34 = 121.75/x
  3. Step 3: Cross multiply
    378.31x = 567.34 × 121.75
  4. Step 4: Simplify right side
    378.31x = 69,073.65
  5. Step 5: Solve for x
    x = 69,073.65/378.31
  6. Step 6: Final answer
    x = 182.58

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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.