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Finding the Fourth Proportional to 321.76, 483.40 and 206.43

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Solution

The fourth proportional to 321.76, 483.40 and 206.43 is: 310.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.76 : 483.40 = 206.43 : x
  2. Step 2: Convert to fraction form
    321.76/483.40 = 206.43/x
  3. Step 3: Cross multiply
    321.76x = 483.40 × 206.43
  4. Step 4: Simplify right side
    321.76x = 99,787.83
  5. Step 5: Solve for x
    x = 99,787.83/321.76
  6. Step 6: Final answer
    x = 310.13

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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.