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Finding the Fourth Proportional to 213.98, 320.68 and 189.55

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Solution

The fourth proportional to 213.98, 320.68 and 189.55 is: 284.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.98 : 320.68 = 189.55 : x
  2. Step 2: Convert to fraction form
    213.98/320.68 = 189.55/x
  3. Step 3: Cross multiply
    213.98x = 320.68 × 189.55
  4. Step 4: Simplify right side
    213.98x = 60,782.34
  5. Step 5: Solve for x
    x = 60,782.34/213.98
  6. Step 6: Final answer
    x = 284.06

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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.