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Finding the Fourth Proportional to 2,819.28, 3,890.90 and 1,641

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Solution

The fourth proportional to 2,819.28, 3,890.90 and 1,641 is: 2,264.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,819.28 : 3,890.90 = 1,641 : x
  2. Step 2: Convert to fraction form
    2,819.28/3,890.90 = 1,641/x
  3. Step 3: Cross multiply
    2,819.28x = 3,890.90 × 1,641
  4. Step 4: Simplify right side
    2,819.28x = 6,384,966.90
  5. Step 5: Solve for x
    x = 6,384,966.90/2,819.28
  6. Step 6: Final answer
    x = 2,264.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.