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Finding the Fourth Proportional to 2,639.25, 3,959.28 and 1,914.30

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Solution

The fourth proportional to 2,639.25, 3,959.28 and 1,914.30 is: 2,871.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.25 : 3,959.28 = 1,914.30 : x
  2. Step 2: Convert to fraction form
    2,639.25/3,959.28 = 1,914.30/x
  3. Step 3: Cross multiply
    2,639.25x = 3,959.28 × 1,914.30
  4. Step 4: Simplify right side
    2,639.25x = 7,579,249.70
  5. Step 5: Solve for x
    x = 7,579,249.70/2,639.25
  6. Step 6: Final answer
    x = 2,871.74

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1.5x scale

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.