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Finding the Fourth Proportional to 518.07, 714.83 and 321.63

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Solution

The fourth proportional to 518.07, 714.83 and 321.63 is: 443.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.07 : 714.83 = 321.63 : x
  2. Step 2: Convert to fraction form
    518.07/714.83 = 321.63/x
  3. Step 3: Cross multiply
    518.07x = 714.83 × 321.63
  4. Step 4: Simplify right side
    518.07x = 229,910.77
  5. Step 5: Solve for x
    x = 229,910.77/518.07
  6. Step 6: Final answer
    x = 443.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.