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Finding the Fourth Proportional to 447.40, 668.49 and 342.68

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Solution

The fourth proportional to 447.40, 668.49 and 342.68 is: 512.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.40 : 668.49 = 342.68 : x
  2. Step 2: Convert to fraction form
    447.40/668.49 = 342.68/x
  3. Step 3: Cross multiply
    447.40x = 668.49 × 342.68
  4. Step 4: Simplify right side
    447.40x = 229,078.15
  5. Step 5: Solve for x
    x = 229,078.15/447.40
  6. Step 6: Final answer
    x = 512.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.