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Finding the Fourth Proportional to 214.37, 321.72 and 84.40

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Solution

The fourth proportional to 214.37, 321.72 and 84.40 is: 126.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.37 : 321.72 = 84.40 : x
  2. Step 2: Convert to fraction form
    214.37/321.72 = 84.40/x
  3. Step 3: Cross multiply
    214.37x = 321.72 × 84.40
  4. Step 4: Simplify right side
    214.37x = 27,154.61
  5. Step 5: Solve for x
    x = 27,154.61/214.37
  6. Step 6: Final answer
    x = 126.67

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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.