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Finding the Fourth Proportional to 321.92, 482.49 and 136.78

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Solution

The fourth proportional to 321.92, 482.49 and 136.78 is: 205.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.92 : 482.49 = 136.78 : x
  2. Step 2: Convert to fraction form
    321.92/482.49 = 136.78/x
  3. Step 3: Cross multiply
    321.92x = 482.49 × 136.78
  4. Step 4: Simplify right side
    321.92x = 65,994.98
  5. Step 5: Solve for x
    x = 65,994.98/321.92
  6. Step 6: Final answer
    x = 205.00

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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.