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Finding the Fourth Proportional to 276.47, 381.34 and 189.26

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Solution

The fourth proportional to 276.47, 381.34 and 189.26 is: 261.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.47 : 381.34 = 189.26 : x
  2. Step 2: Convert to fraction form
    276.47/381.34 = 189.26/x
  3. Step 3: Cross multiply
    276.47x = 381.34 × 189.26
  4. Step 4: Simplify right side
    276.47x = 72,172.41
  5. Step 5: Solve for x
    x = 72,172.41/276.47
  6. Step 6: Final answer
    x = 261.05

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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.