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Finding the Fourth Proportional to 214.03, 321.05 and 69.76

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Solution

The fourth proportional to 214.03, 321.05 and 69.76 is: 104.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.03 : 321.05 = 69.76 : x
  2. Step 2: Convert to fraction form
    214.03/321.05 = 69.76/x
  3. Step 3: Cross multiply
    214.03x = 321.05 × 69.76
  4. Step 4: Simplify right side
    214.03x = 22,396.45
  5. Step 5: Solve for x
    x = 22,396.45/214.03
  6. Step 6: Final answer
    x = 104.64

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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.