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Finding the Fourth Proportional to 1,291.28, 1,936.20 and 880.88

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Solution

The fourth proportional to 1,291.28, 1,936.20 and 880.88 is: 1,320.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.28 : 1,936.20 = 880.88 : x
  2. Step 2: Convert to fraction form
    1,291.28/1,936.20 = 880.88/x
  3. Step 3: Cross multiply
    1,291.28x = 1,936.20 × 880.88
  4. Step 4: Simplify right side
    1,291.28x = 1,705,553.48
  5. Step 5: Solve for x
    x = 1,705,553.48/1,291.28
  6. Step 6: Final answer
    x = 1,320.83

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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.