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Finding the Fourth Proportional to 391.60, 587.59 and 276.78

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Solution

The fourth proportional to 391.60, 587.59 and 276.78 is: 415.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.60 : 587.59 = 276.78 : x
  2. Step 2: Convert to fraction form
    391.60/587.59 = 276.78/x
  3. Step 3: Cross multiply
    391.60x = 587.59 × 276.78
  4. Step 4: Simplify right side
    391.60x = 162,635.22
  5. Step 5: Solve for x
    x = 162,635.22/391.60
  6. Step 6: Final answer
    x = 415.31

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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.