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Finding the Fourth Proportional to 723.92, 995.92 and 639.47

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Solution

The fourth proportional to 723.92, 995.92 and 639.47 is: 879.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.92 : 995.92 = 639.47 : x
  2. Step 2: Convert to fraction form
    723.92/995.92 = 639.47/x
  3. Step 3: Cross multiply
    723.92x = 995.92 × 639.47
  4. Step 4: Simplify right side
    723.92x = 636,861.85
  5. Step 5: Solve for x
    x = 636,861.85/723.92
  6. Step 6: Final answer
    x = 879.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.