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Finding the Fourth Proportional to 276.49, 381.45 and 189.24

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Solution

The fourth proportional to 276.49, 381.45 and 189.24 is: 261.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.49 : 381.45 = 189.24 : x
  2. Step 2: Convert to fraction form
    276.49/381.45 = 189.24/x
  3. Step 3: Cross multiply
    276.49x = 381.45 × 189.24
  4. Step 4: Simplify right side
    276.49x = 72,185.60
  5. Step 5: Solve for x
    x = 72,185.60/276.49
  6. Step 6: Final answer
    x = 261.08

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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.