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Finding the Fourth Proportional to 2,124.40, 3,187 and 663.44

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Solution

The fourth proportional to 2,124.40, 3,187 and 663.44 is: 995.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,124.40 : 3,187 = 663.44 : x
  2. Step 2: Convert to fraction form
    2,124.40/3,187 = 663.44/x
  3. Step 3: Cross multiply
    2,124.40x = 3,187 × 663.44
  4. Step 4: Simplify right side
    2,124.40x = 2,114,383.28
  5. Step 5: Solve for x
    x = 2,114,383.28/2,124.40
  6. Step 6: Final answer
    x = 995.28

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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.