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Finding the Fourth Proportional to 279.56, 388.46 and 276.56

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Solution

The fourth proportional to 279.56, 388.46 and 276.56 is: 384.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.56 : 388.46 = 276.56 : x
  2. Step 2: Convert to fraction form
    279.56/388.46 = 276.56/x
  3. Step 3: Cross multiply
    279.56x = 388.46 × 276.56
  4. Step 4: Simplify right side
    279.56x = 107,432.50
  5. Step 5: Solve for x
    x = 107,432.50/279.56
  6. Step 6: Final answer
    x = 384.29

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.