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Finding the Fourth Proportional to 215.20, 324.52 and 213.76

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Solution

The fourth proportional to 215.20, 324.52 and 213.76 is: 322.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.20 : 324.52 = 213.76 : x
  2. Step 2: Convert to fraction form
    215.20/324.52 = 213.76/x
  3. Step 3: Cross multiply
    215.20x = 324.52 × 213.76
  4. Step 4: Simplify right side
    215.20x = 69,369.40
  5. Step 5: Solve for x
    x = 69,369.40/215.20
  6. Step 6: Final answer
    x = 322.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.