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Finding the Fourth Proportional to 354.21, 531.37 and 215.49

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Solution

The fourth proportional to 354.21, 531.37 and 215.49 is: 323.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.21 : 531.37 = 215.49 : x
  2. Step 2: Convert to fraction form
    354.21/531.37 = 215.49/x
  3. Step 3: Cross multiply
    354.21x = 531.37 × 215.49
  4. Step 4: Simplify right side
    354.21x = 114,506.37
  5. Step 5: Solve for x
    x = 114,506.37/354.21
  6. Step 6: Final answer
    x = 323.27

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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.