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Finding the Fourth Proportional to 518.27, 715.23 and 321.66

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Solution

The fourth proportional to 518.27, 715.23 and 321.66 is: 443.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.27 : 715.23 = 321.66 : x
  2. Step 2: Convert to fraction form
    518.27/715.23 = 321.66/x
  3. Step 3: Cross multiply
    518.27x = 715.23 × 321.66
  4. Step 4: Simplify right side
    518.27x = 230,060.88
  5. Step 5: Solve for x
    x = 230,060.88/518.27
  6. Step 6: Final answer
    x = 443.91

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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.