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Finding the Fourth Proportional to 214.19, 321.33 and 69.91

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Solution

The fourth proportional to 214.19, 321.33 and 69.91 is: 104.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.19 : 321.33 = 69.91 : x
  2. Step 2: Convert to fraction form
    214.19/321.33 = 69.91/x
  3. Step 3: Cross multiply
    214.19x = 321.33 × 69.91
  4. Step 4: Simplify right side
    214.19x = 22,464.18
  5. Step 5: Solve for x
    x = 22,464.18/214.19
  6. Step 6: Final answer
    x = 104.88

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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.