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Finding the Fourth Proportional to 214.99, 321.96 and 209.51

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Solution

The fourth proportional to 214.99, 321.96 and 209.51 is: 313.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.99 : 321.96 = 209.51 : x
  2. Step 2: Convert to fraction form
    214.99/321.96 = 209.51/x
  3. Step 3: Cross multiply
    214.99x = 321.96 × 209.51
  4. Step 4: Simplify right side
    214.99x = 67,453.84
  5. Step 5: Solve for x
    x = 67,453.84/214.99
  6. Step 6: Final answer
    x = 313.75

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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.