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Finding the Fourth Proportional to 389.99, 585.09 and 324.64

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Solution

The fourth proportional to 389.99, 585.09 and 324.64 is: 487.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.99 : 585.09 = 324.64 : x
  2. Step 2: Convert to fraction form
    389.99/585.09 = 324.64/x
  3. Step 3: Cross multiply
    389.99x = 585.09 × 324.64
  4. Step 4: Simplify right side
    389.99x = 189,939.07
  5. Step 5: Solve for x
    x = 189,939.07/389.99
  6. Step 6: Final answer
    x = 487.04

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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.