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Finding the Fourth Proportional to 281.56, 391.24 and 278.56

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Solution

The fourth proportional to 281.56, 391.24 and 278.56 is: 387.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.56 : 391.24 = 278.56 : x
  2. Step 2: Convert to fraction form
    281.56/391.24 = 278.56/x
  3. Step 3: Cross multiply
    281.56x = 391.24 × 278.56
  4. Step 4: Simplify right side
    281.56x = 108,983.81
  5. Step 5: Solve for x
    x = 108,983.81/281.56
  6. Step 6: Final answer
    x = 387.07

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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.