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Finding the Fourth Proportional to 359.82, 538.99 and 213.21

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Solution

The fourth proportional to 359.82, 538.99 and 213.21 is: 319.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.82 : 538.99 = 213.21 : x
  2. Step 2: Convert to fraction form
    359.82/538.99 = 213.21/x
  3. Step 3: Cross multiply
    359.82x = 538.99 × 213.21
  4. Step 4: Simplify right side
    359.82x = 114,918.06
  5. Step 5: Solve for x
    x = 114,918.06/359.82
  6. Step 6: Final answer
    x = 319.38

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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.