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Finding the Fourth Proportional to 391.16, 539.69 and 273

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Solution

The fourth proportional to 391.16, 539.69 and 273 is: 376.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.16 : 539.69 = 273 : x
  2. Step 2: Convert to fraction form
    391.16/539.69 = 273/x
  3. Step 3: Cross multiply
    391.16x = 539.69 × 273
  4. Step 4: Simplify right side
    391.16x = 147,335.37
  5. Step 5: Solve for x
    x = 147,335.37/391.16
  6. Step 6: Final answer
    x = 376.66

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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.