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Finding the Fourth Proportional to 664.32, 995.22 and 390.54

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Solution

The fourth proportional to 664.32, 995.22 and 390.54 is: 585.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.32 : 995.22 = 390.54 : x
  2. Step 2: Convert to fraction form
    664.32/995.22 = 390.54/x
  3. Step 3: Cross multiply
    664.32x = 995.22 × 390.54
  4. Step 4: Simplify right side
    664.32x = 388,673.22
  5. Step 5: Solve for x
    x = 388,673.22/664.32
  6. Step 6: Final answer
    x = 585.07

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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.