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Finding the Fourth Proportional to 321.15, 443.19 and 247.34

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Solution

The fourth proportional to 321.15, 443.19 and 247.34 is: 341.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.15 : 443.19 = 247.34 : x
  2. Step 2: Convert to fraction form
    321.15/443.19 = 247.34/x
  3. Step 3: Cross multiply
    321.15x = 443.19 × 247.34
  4. Step 4: Simplify right side
    321.15x = 109,616.40
  5. Step 5: Solve for x
    x = 109,616.40/321.15
  6. Step 6: Final answer
    x = 341.32

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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.