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Finding the Fourth Proportional to 397, 547.85 and 219.95

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Solution

The fourth proportional to 397, 547.85 and 219.95 is: 303.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    397 : 547.85 = 219.95 : x
  2. Step 2: Convert to fraction form
    397/547.85 = 219.95/x
  3. Step 3: Cross multiply
    397x = 547.85 × 219.95
  4. Step 4: Simplify right side
    397x = 120,499.61
  5. Step 5: Solve for x
    x = 120,499.61/397
  6. Step 6: Final answer
    x = 303.53

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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.