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Finding the Fourth Proportional to 2,174.87, 3,261.52 and 787.84

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Solution

The fourth proportional to 2,174.87, 3,261.52 and 787.84 is: 1,181.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,174.87 : 3,261.52 = 787.84 : x
  2. Step 2: Convert to fraction form
    2,174.87/3,261.52 = 787.84/x
  3. Step 3: Cross multiply
    2,174.87x = 3,261.52 × 787.84
  4. Step 4: Simplify right side
    2,174.87x = 2,569,551.98
  5. Step 5: Solve for x
    x = 2,569,551.98/2,174.87
  6. Step 6: Final answer
    x = 1,181.48

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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.