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Finding the Fourth Proportional to 1,215.26, 1,819.64 and 664.86

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Solution

The fourth proportional to 1,215.26, 1,819.64 and 664.86 is: 995.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.26 : 1,819.64 = 664.86 : x
  2. Step 2: Convert to fraction form
    1,215.26/1,819.64 = 664.86/x
  3. Step 3: Cross multiply
    1,215.26x = 1,819.64 × 664.86
  4. Step 4: Simplify right side
    1,215.26x = 1,209,805.85
  5. Step 5: Solve for x
    x = 1,209,805.85/1,215.26
  6. Step 6: Final answer
    x = 995.51

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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.