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Finding the Fourth Proportional to 290.82, 434.57 and 213.26

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Solution

The fourth proportional to 290.82, 434.57 and 213.26 is: 318.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.82 : 434.57 = 213.26 : x
  2. Step 2: Convert to fraction form
    290.82/434.57 = 213.26/x
  3. Step 3: Cross multiply
    290.82x = 434.57 × 213.26
  4. Step 4: Simplify right side
    290.82x = 92,676.40
  5. Step 5: Solve for x
    x = 92,676.40/290.82
  6. Step 6: Final answer
    x = 318.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.