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Finding the Fourth Proportional to 390.22, 585.32 and 321.46

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Solution

The fourth proportional to 390.22, 585.32 and 321.46 is: 482.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.22 : 585.32 = 321.46 : x
  2. Step 2: Convert to fraction form
    390.22/585.32 = 321.46/x
  3. Step 3: Cross multiply
    390.22x = 585.32 × 321.46
  4. Step 4: Simplify right side
    390.22x = 188,156.97
  5. Step 5: Solve for x
    x = 188,156.97/390.22
  6. Step 6: Final answer
    x = 482.18

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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.