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Finding the Fourth Proportional to 518.37, 715.37 and 321.95

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Solution

The fourth proportional to 518.37, 715.37 and 321.95 is: 444.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.37 : 715.37 = 321.95 : x
  2. Step 2: Convert to fraction form
    518.37/715.37 = 321.95/x
  3. Step 3: Cross multiply
    518.37x = 715.37 × 321.95
  4. Step 4: Simplify right side
    518.37x = 230,308.18
  5. Step 5: Solve for x
    x = 230,308.18/518.37
  6. Step 6: Final answer
    x = 444.29

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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.