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Finding the Fourth Proportional to 2,787.49, 4,181.90 and 813.18

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Solution

The fourth proportional to 2,787.49, 4,181.90 and 813.18 is: 1,219.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,787.49 : 4,181.90 = 813.18 : x
  2. Step 2: Convert to fraction form
    2,787.49/4,181.90 = 813.18/x
  3. Step 3: Cross multiply
    2,787.49x = 4,181.90 × 813.18
  4. Step 4: Simplify right side
    2,787.49x = 3,400,649.06
  5. Step 5: Solve for x
    x = 3,400,649.06/2,787.49
  6. Step 6: Final answer
    x = 1,219.97

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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.