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Finding the Fourth Proportional to 321.37, 440.44 and 315.29

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Solution

The fourth proportional to 321.37, 440.44 and 315.29 is: 432.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.37 : 440.44 = 315.29 : x
  2. Step 2: Convert to fraction form
    321.37/440.44 = 315.29/x
  3. Step 3: Cross multiply
    321.37x = 440.44 × 315.29
  4. Step 4: Simplify right side
    321.37x = 138,866.64
  5. Step 5: Solve for x
    x = 138,866.64/321.37
  6. Step 6: Final answer
    x = 432.11

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.