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Finding the Fourth Proportional to 276.40, 414.81 and 189.55

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Solution

The fourth proportional to 276.40, 414.81 and 189.55 is: 284.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.40 : 414.81 = 189.55 : x
  2. Step 2: Convert to fraction form
    276.40/414.81 = 189.55/x
  3. Step 3: Cross multiply
    276.40x = 414.81 × 189.55
  4. Step 4: Simplify right side
    276.40x = 78,627.24
  5. Step 5: Solve for x
    x = 78,627.24/276.40
  6. Step 6: Final answer
    x = 284.47

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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.