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Finding the Fourth Proportional to 2,245.88, 3,369 and 685.74

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Solution

The fourth proportional to 2,245.88, 3,369 and 685.74 is: 1,028.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,245.88 : 3,369 = 685.74 : x
  2. Step 2: Convert to fraction form
    2,245.88/3,369 = 685.74/x
  3. Step 3: Cross multiply
    2,245.88x = 3,369 × 685.74
  4. Step 4: Simplify right side
    2,245.88x = 2,310,258.06
  5. Step 5: Solve for x
    x = 2,310,258.06/2,245.88
  6. Step 6: Final answer
    x = 1,028.66

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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.