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Finding the Fourth Proportional to 2,124.88, 3,187.20 and 663.64

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Solution

The fourth proportional to 2,124.88, 3,187.20 and 663.64 is: 995.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,124.88 : 3,187.20 = 663.64 : x
  2. Step 2: Convert to fraction form
    2,124.88/3,187.20 = 663.64/x
  3. Step 3: Cross multiply
    2,124.88x = 3,187.20 × 663.64
  4. Step 4: Simplify right side
    2,124.88x = 2,115,153.41
  5. Step 5: Solve for x
    x = 2,115,153.41/2,124.88
  6. Step 6: Final answer
    x = 995.42

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1.5x scale

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.