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Finding the Fourth Proportional to 321.20, 482.02 and 138.66

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Solution

The fourth proportional to 321.20, 482.02 and 138.66 is: 208.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.20 : 482.02 = 138.66 : x
  2. Step 2: Convert to fraction form
    321.20/482.02 = 138.66/x
  3. Step 3: Cross multiply
    321.20x = 482.02 × 138.66
  4. Step 4: Simplify right side
    321.20x = 66,836.89
  5. Step 5: Solve for x
    x = 66,836.89/321.20
  6. Step 6: Final answer
    x = 208.08

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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.