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Finding the Fourth Proportional to 2,489.72, 3,730.52 and 1,319.64

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Solution

The fourth proportional to 2,489.72, 3,730.52 and 1,319.64 is: 1,977.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.72 : 3,730.52 = 1,319.64 : x
  2. Step 2: Convert to fraction form
    2,489.72/3,730.52 = 1,319.64/x
  3. Step 3: Cross multiply
    2,489.72x = 3,730.52 × 1,319.64
  4. Step 4: Simplify right side
    2,489.72x = 4,922,943.41
  5. Step 5: Solve for x
    x = 4,922,943.41/2,489.72
  6. Step 6: Final answer
    x = 1,977.31

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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.