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Finding the Fourth Proportional to 2,787.68, 4,181.52 and 1,813.28

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Solution

The fourth proportional to 2,787.68, 4,181.52 and 1,813.28 is: 2,719.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,787.68 : 4,181.52 = 1,813.28 : x
  2. Step 2: Convert to fraction form
    2,787.68/4,181.52 = 1,813.28/x
  3. Step 3: Cross multiply
    2,787.68x = 4,181.52 × 1,813.28
  4. Step 4: Simplify right side
    2,787.68x = 7,582,266.59
  5. Step 5: Solve for x
    x = 7,582,266.59/2,787.68
  6. Step 6: Final answer
    x = 2,719.92

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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.