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Finding the Fourth Proportional to 429.78, 645.14 and 344.14

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Solution

The fourth proportional to 429.78, 645.14 and 344.14 is: 516.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.78 : 645.14 = 344.14 : x
  2. Step 2: Convert to fraction form
    429.78/645.14 = 344.14/x
  3. Step 3: Cross multiply
    429.78x = 645.14 × 344.14
  4. Step 4: Simplify right side
    429.78x = 222,018.48
  5. Step 5: Solve for x
    x = 222,018.48/429.78
  6. Step 6: Final answer
    x = 516.59

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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.