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Finding the Fourth Proportional to 2,124.69, 3,187.06 and 663.85

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Solution

The fourth proportional to 2,124.69, 3,187.06 and 663.85 is: 995.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,124.69 : 3,187.06 = 663.85 : x
  2. Step 2: Convert to fraction form
    2,124.69/3,187.06 = 663.85/x
  3. Step 3: Cross multiply
    2,124.69x = 3,187.06 × 663.85
  4. Step 4: Simplify right side
    2,124.69x = 2,115,726.46
  5. Step 5: Solve for x
    x = 2,115,726.46/2,124.69
  6. Step 6: Final answer
    x = 995.78

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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.