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Finding the Fourth Proportional to 2,157.18, 3,235.08 and 696

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Solution

The fourth proportional to 2,157.18, 3,235.08 and 696 is: 1,043.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.18 : 3,235.08 = 696 : x
  2. Step 2: Convert to fraction form
    2,157.18/3,235.08 = 696/x
  3. Step 3: Cross multiply
    2,157.18x = 3,235.08 × 696
  4. Step 4: Simplify right side
    2,157.18x = 2,251,615.68
  5. Step 5: Solve for x
    x = 2,251,615.68/2,157.18
  6. Step 6: Final answer
    x = 1,043.78

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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.