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Finding the Fourth Proportional to 391.14, 539.52 and 303.66

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Solution

The fourth proportional to 391.14, 539.52 and 303.66 is: 418.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.14 : 539.52 = 303.66 : x
  2. Step 2: Convert to fraction form
    391.14/539.52 = 303.66/x
  3. Step 3: Cross multiply
    391.14x = 539.52 × 303.66
  4. Step 4: Simplify right side
    391.14x = 163,830.64
  5. Step 5: Solve for x
    x = 163,830.64/391.14
  6. Step 6: Final answer
    x = 418.85

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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.