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Finding the Fourth Proportional to 214.46, 321.51 and 145.79

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Solution

The fourth proportional to 214.46, 321.51 and 145.79 is: 218.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.46 : 321.51 = 145.79 : x
  2. Step 2: Convert to fraction form
    214.46/321.51 = 145.79/x
  3. Step 3: Cross multiply
    214.46x = 321.51 × 145.79
  4. Step 4: Simplify right side
    214.46x = 46,872.94
  5. Step 5: Solve for x
    x = 46,872.94/214.46
  6. Step 6: Final answer
    x = 218.56

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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.