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Finding the Fourth Proportional to 378.57, 567.96 and 131.79

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Solution

The fourth proportional to 378.57, 567.96 and 131.79 is: 197.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.57 : 567.96 = 131.79 : x
  2. Step 2: Convert to fraction form
    378.57/567.96 = 131.79/x
  3. Step 3: Cross multiply
    378.57x = 567.96 × 131.79
  4. Step 4: Simplify right side
    378.57x = 74,851.45
  5. Step 5: Solve for x
    x = 74,851.45/378.57
  6. Step 6: Final answer
    x = 197.72

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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.