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Finding the Fourth Proportional to 391.08, 538.58 and 324.98

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Solution

The fourth proportional to 391.08, 538.58 and 324.98 is: 447.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.08 : 538.58 = 324.98 : x
  2. Step 2: Convert to fraction form
    391.08/538.58 = 324.98/x
  3. Step 3: Cross multiply
    391.08x = 538.58 × 324.98
  4. Step 4: Simplify right side
    391.08x = 175,027.73
  5. Step 5: Solve for x
    x = 175,027.73/391.08
  6. Step 6: Final answer
    x = 447.55

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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.