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Finding the Fourth Proportional to 393.98, 543.68 and 216.95

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Solution

The fourth proportional to 393.98, 543.68 and 216.95 is: 299.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.98 : 543.68 = 216.95 : x
  2. Step 2: Convert to fraction form
    393.98/543.68 = 216.95/x
  3. Step 3: Cross multiply
    393.98x = 543.68 × 216.95
  4. Step 4: Simplify right side
    393.98x = 117,947.57
  5. Step 5: Solve for x
    x = 117,947.57/393.98
  6. Step 6: Final answer
    x = 299.38

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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.