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Finding the Fourth Proportional to 321.17, 442.87 and 238.14

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Solution

The fourth proportional to 321.17, 442.87 and 238.14 is: 328.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.17 : 442.87 = 238.14 : x
  2. Step 2: Convert to fraction form
    321.17/442.87 = 238.14/x
  3. Step 3: Cross multiply
    321.17x = 442.87 × 238.14
  4. Step 4: Simplify right side
    321.17x = 105,464.47
  5. Step 5: Solve for x
    x = 105,464.47/321.17
  6. Step 6: Final answer
    x = 328.38

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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.