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Finding the Fourth Proportional to 390.85, 588.96 and 323.88

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Solution

The fourth proportional to 390.85, 588.96 and 323.88 is: 488.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.85 : 588.96 = 323.88 : x
  2. Step 2: Convert to fraction form
    390.85/588.96 = 323.88/x
  3. Step 3: Cross multiply
    390.85x = 588.96 × 323.88
  4. Step 4: Simplify right side
    390.85x = 190,752.36
  5. Step 5: Solve for x
    x = 190,752.36/390.85
  6. Step 6: Final answer
    x = 488.04

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.