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Finding the Fourth Proportional to 321.68, 442.86 and 277.25

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Solution

The fourth proportional to 321.68, 442.86 and 277.25 is: 381.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.68 : 442.86 = 277.25 : x
  2. Step 2: Convert to fraction form
    321.68/442.86 = 277.25/x
  3. Step 3: Cross multiply
    321.68x = 442.86 × 277.25
  4. Step 4: Simplify right side
    321.68x = 122,780.72
  5. Step 5: Solve for x
    x = 122,780.72/321.68
  6. Step 6: Final answer
    x = 381.69

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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.