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Finding the Fourth Proportional to 663.94, 995.90 and 279.20

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Solution

The fourth proportional to 663.94, 995.90 and 279.20 is: 418.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.94 : 995.90 = 279.20 : x
  2. Step 2: Convert to fraction form
    663.94/995.90 = 279.20/x
  3. Step 3: Cross multiply
    663.94x = 995.90 × 279.20
  4. Step 4: Simplify right side
    663.94x = 278,055.28
  5. Step 5: Solve for x
    x = 278,055.28/663.94
  6. Step 6: Final answer
    x = 418.80

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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.