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Finding the Fourth Proportional to 391.42, 585.52 and 322.17

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Solution

The fourth proportional to 391.42, 585.52 and 322.17 is: 481.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.42 : 585.52 = 322.17 : x
  2. Step 2: Convert to fraction form
    391.42/585.52 = 322.17/x
  3. Step 3: Cross multiply
    391.42x = 585.52 × 322.17
  4. Step 4: Simplify right side
    391.42x = 188,636.98
  5. Step 5: Solve for x
    x = 188,636.98/391.42
  6. Step 6: Final answer
    x = 481.93

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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.