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Finding the Fourth Proportional to 391.99, 540.95 and 217.33

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Solution

The fourth proportional to 391.99, 540.95 and 217.33 is: 299.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.99 : 540.95 = 217.33 : x
  2. Step 2: Convert to fraction form
    391.99/540.95 = 217.33/x
  3. Step 3: Cross multiply
    391.99x = 540.95 × 217.33
  4. Step 4: Simplify right side
    391.99x = 117,563.58
  5. Step 5: Solve for x
    x = 117,563.58/391.99
  6. Step 6: Final answer
    x = 299.92

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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.