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Finding the Fourth Proportional to 213.98, 320.82 and 191.18

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Solution

The fourth proportional to 213.98, 320.82 and 191.18 is: 286.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.98 : 320.82 = 191.18 : x
  2. Step 2: Convert to fraction form
    213.98/320.82 = 191.18/x
  3. Step 3: Cross multiply
    213.98x = 320.82 × 191.18
  4. Step 4: Simplify right side
    213.98x = 61,334.37
  5. Step 5: Solve for x
    x = 61,334.37/213.98
  6. Step 6: Final answer
    x = 286.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.