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Finding the Fourth Proportional to 391.35, 539.69 and 266.82

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Solution

The fourth proportional to 391.35, 539.69 and 266.82 is: 367.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.35 : 539.69 = 266.82 : x
  2. Step 2: Convert to fraction form
    391.35/539.69 = 266.82/x
  3. Step 3: Cross multiply
    391.35x = 539.69 × 266.82
  4. Step 4: Simplify right side
    391.35x = 144,000.09
  5. Step 5: Solve for x
    x = 144,000.09/391.35
  6. Step 6: Final answer
    x = 367.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.