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Finding the Fourth Proportional to 214.55, 321.74 and 82.76

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Solution

The fourth proportional to 214.55, 321.74 and 82.76 is: 124.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.55 : 321.74 = 82.76 : x
  2. Step 2: Convert to fraction form
    214.55/321.74 = 82.76/x
  3. Step 3: Cross multiply
    214.55x = 321.74 × 82.76
  4. Step 4: Simplify right side
    214.55x = 26,625.18
  5. Step 5: Solve for x
    x = 26,625.18/214.55
  6. Step 6: Final answer
    x = 124.10

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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.