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Finding the Fourth Proportional to 664.38, 995.76 and 432.72

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Solution

The fourth proportional to 664.38, 995.76 and 432.72 is: 648.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.38 : 995.76 = 432.72 : x
  2. Step 2: Convert to fraction form
    664.38/995.76 = 432.72/x
  3. Step 3: Cross multiply
    664.38x = 995.76 × 432.72
  4. Step 4: Simplify right side
    664.38x = 430,885.27
  5. Step 5: Solve for x
    x = 430,885.27/664.38
  6. Step 6: Final answer
    x = 648.55

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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.