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Finding the Fourth Proportional to 321.68, 442.76 and 274.89

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Solution

The fourth proportional to 321.68, 442.76 and 274.89 is: 378.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.68 : 442.76 = 274.89 : x
  2. Step 2: Convert to fraction form
    321.68/442.76 = 274.89/x
  3. Step 3: Cross multiply
    321.68x = 442.76 × 274.89
  4. Step 4: Simplify right side
    321.68x = 121,708.92
  5. Step 5: Solve for x
    x = 121,708.92/321.68
  6. Step 6: Final answer
    x = 378.36

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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.