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Finding the Fourth Proportional to 1,273.70, 1,911.01 and 787.09

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Solution

The fourth proportional to 1,273.70, 1,911.01 and 787.09 is: 1,180.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.70 : 1,911.01 = 787.09 : x
  2. Step 2: Convert to fraction form
    1,273.70/1,911.01 = 787.09/x
  3. Step 3: Cross multiply
    1,273.70x = 1,911.01 × 787.09
  4. Step 4: Simplify right side
    1,273.70x = 1,504,137.23
  5. Step 5: Solve for x
    x = 1,504,137.23/1,273.70
  6. Step 6: Final answer
    x = 1,180.92

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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.