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Finding the Fourth Proportional to 215.22, 322.83 and 211.78

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Solution

The fourth proportional to 215.22, 322.83 and 211.78 is: 317.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.22 : 322.83 = 211.78 : x
  2. Step 2: Convert to fraction form
    215.22/322.83 = 211.78/x
  3. Step 3: Cross multiply
    215.22x = 322.83 × 211.78
  4. Step 4: Simplify right side
    215.22x = 68,368.94
  5. Step 5: Solve for x
    x = 68,368.94/215.22
  6. Step 6: Final answer
    x = 317.67

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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.