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Finding the Fourth Proportional to 214.74, 321.69 and 127.89

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Solution

The fourth proportional to 214.74, 321.69 and 127.89 is: 191.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.74 : 321.69 = 127.89 : x
  2. Step 2: Convert to fraction form
    214.74/321.69 = 127.89/x
  3. Step 3: Cross multiply
    214.74x = 321.69 × 127.89
  4. Step 4: Simplify right side
    214.74x = 41,140.93
  5. Step 5: Solve for x
    x = 41,140.93/214.74
  6. Step 6: Final answer
    x = 191.58

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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.