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Finding the Fourth Proportional to 1,291.20, 1,936.25 and 880.66

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Solution

The fourth proportional to 1,291.20, 1,936.25 and 880.66 is: 1,320.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.20 : 1,936.25 = 880.66 : x
  2. Step 2: Convert to fraction form
    1,291.20/1,936.25 = 880.66/x
  3. Step 3: Cross multiply
    1,291.20x = 1,936.25 × 880.66
  4. Step 4: Simplify right side
    1,291.20x = 1,705,177.93
  5. Step 5: Solve for x
    x = 1,705,177.93/1,291.20
  6. Step 6: Final answer
    x = 1,320.61

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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.