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Finding the Fourth Proportional to 214.71, 321.96 and 92.91

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Solution

The fourth proportional to 214.71, 321.96 and 92.91 is: 139.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.71 : 321.96 = 92.91 : x
  2. Step 2: Convert to fraction form
    214.71/321.96 = 92.91/x
  3. Step 3: Cross multiply
    214.71x = 321.96 × 92.91
  4. Step 4: Simplify right side
    214.71x = 29,913.30
  5. Step 5: Solve for x
    x = 29,913.30/214.71
  6. Step 6: Final answer
    x = 139.32

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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.