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Finding the Fourth Proportional to 213.72, 320.99 and 133.13

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Solution

The fourth proportional to 213.72, 320.99 and 133.13 is: 199.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.72 : 320.99 = 133.13 : x
  2. Step 2: Convert to fraction form
    213.72/320.99 = 133.13/x
  3. Step 3: Cross multiply
    213.72x = 320.99 × 133.13
  4. Step 4: Simplify right side
    213.72x = 42,731.13
  5. Step 5: Solve for x
    x = 42,731.13/213.72
  6. Step 6: Final answer
    x = 199.94

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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.