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Finding the Fourth Proportional to 486.14, 729.34 and 212.25

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Solution

The fourth proportional to 486.14, 729.34 and 212.25 is: 318.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.14 : 729.34 = 212.25 : x
  2. Step 2: Convert to fraction form
    486.14/729.34 = 212.25/x
  3. Step 3: Cross multiply
    486.14x = 729.34 × 212.25
  4. Step 4: Simplify right side
    486.14x = 154,804.62
  5. Step 5: Solve for x
    x = 154,804.62/486.14
  6. Step 6: Final answer
    x = 318.44

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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.