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Finding the Fourth Proportional to 2,489.58, 3,734.25 and 640.74

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Solution

The fourth proportional to 2,489.58, 3,734.25 and 640.74 is: 961.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.58 : 3,734.25 = 640.74 : x
  2. Step 2: Convert to fraction form
    2,489.58/3,734.25 = 640.74/x
  3. Step 3: Cross multiply
    2,489.58x = 3,734.25 × 640.74
  4. Step 4: Simplify right side
    2,489.58x = 2,392,683.35
  5. Step 5: Solve for x
    x = 2,392,683.35/2,489.58
  6. Step 6: Final answer
    x = 961.08

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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.