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Finding the Fourth Proportional to 2,086.58, 3,129.84 and 699.90

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Solution

The fourth proportional to 2,086.58, 3,129.84 and 699.90 is: 1,049.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.58 : 3,129.84 = 699.90 : x
  2. Step 2: Convert to fraction form
    2,086.58/3,129.84 = 699.90/x
  3. Step 3: Cross multiply
    2,086.58x = 3,129.84 × 699.90
  4. Step 4: Simplify right side
    2,086.58x = 2,190,575.02
  5. Step 5: Solve for x
    x = 2,190,575.02/2,086.58
  6. Step 6: Final answer
    x = 1,049.84

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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.