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Finding the Fourth Proportional to 378.08, 567.08 and 131.28

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Solution

The fourth proportional to 378.08, 567.08 and 131.28 is: 196.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.08 : 567.08 = 131.28 : x
  2. Step 2: Convert to fraction form
    378.08/567.08 = 131.28/x
  3. Step 3: Cross multiply
    378.08x = 567.08 × 131.28
  4. Step 4: Simplify right side
    378.08x = 74,446.26
  5. Step 5: Solve for x
    x = 74,446.26/378.08
  6. Step 6: Final answer
    x = 196.91

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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.