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Finding the Fourth Proportional to 216.70, 322.70 and 216.09

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Solution

The fourth proportional to 216.70, 322.70 and 216.09 is: 321.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.70 : 322.70 = 216.09 : x
  2. Step 2: Convert to fraction form
    216.70/322.70 = 216.09/x
  3. Step 3: Cross multiply
    216.70x = 322.70 × 216.09
  4. Step 4: Simplify right side
    216.70x = 69,731.16
  5. Step 5: Solve for x
    x = 69,731.16/216.70
  6. Step 6: Final answer
    x = 321.79

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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.