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Finding the Fourth Proportional to 2,787.88, 3,847.28 and 1,528.90

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Solution

The fourth proportional to 2,787.88, 3,847.28 and 1,528.90 is: 2,109.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,787.88 : 3,847.28 = 1,528.90 : x
  2. Step 2: Convert to fraction form
    2,787.88/3,847.28 = 1,528.90/x
  3. Step 3: Cross multiply
    2,787.88x = 3,847.28 × 1,528.90
  4. Step 4: Simplify right side
    2,787.88x = 5,882,098.75
  5. Step 5: Solve for x
    x = 5,882,098.75/2,787.88
  6. Step 6: Final answer
    x = 2,109.88

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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.