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Finding the Fourth Proportional to 321.12, 482.37 and 205.86

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Solution

The fourth proportional to 321.12, 482.37 and 205.86 is: 309.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.12 : 482.37 = 205.86 : x
  2. Step 2: Convert to fraction form
    321.12/482.37 = 205.86/x
  3. Step 3: Cross multiply
    321.12x = 482.37 × 205.86
  4. Step 4: Simplify right side
    321.12x = 99,300.69
  5. Step 5: Solve for x
    x = 99,300.69/321.12
  6. Step 6: Final answer
    x = 309.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.