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Finding the Fourth Proportional to 2,489.76, 3,730.86 and 1,189.44

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Solution

The fourth proportional to 2,489.76, 3,730.86 and 1,189.44 is: 1,782.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.76 : 3,730.86 = 1,189.44 : x
  2. Step 2: Convert to fraction form
    2,489.76/3,730.86 = 1,189.44/x
  3. Step 3: Cross multiply
    2,489.76x = 3,730.86 × 1,189.44
  4. Step 4: Simplify right side
    2,489.76x = 4,437,634.12
  5. Step 5: Solve for x
    x = 4,437,634.12/2,489.76
  6. Step 6: Final answer
    x = 1,782.35

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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.