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Finding the Fourth Proportional to 391.78, 588.03 and 276.67

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Solution

The fourth proportional to 391.78, 588.03 and 276.67 is: 415.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.78 : 588.03 = 276.67 : x
  2. Step 2: Convert to fraction form
    391.78/588.03 = 276.67/x
  3. Step 3: Cross multiply
    391.78x = 588.03 × 276.67
  4. Step 4: Simplify right side
    391.78x = 162,690.26
  5. Step 5: Solve for x
    x = 162,690.26/391.78
  6. Step 6: Final answer
    x = 415.26

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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.