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Finding the Fourth Proportional to 1,311.76, 1,963.80 and 795.28

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Solution

The fourth proportional to 1,311.76, 1,963.80 and 795.28 is: 1,190.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.76 : 1,963.80 = 795.28 : x
  2. Step 2: Convert to fraction form
    1,311.76/1,963.80 = 795.28/x
  3. Step 3: Cross multiply
    1,311.76x = 1,963.80 × 795.28
  4. Step 4: Simplify right side
    1,311.76x = 1,561,770.86
  5. Step 5: Solve for x
    x = 1,561,770.86/1,311.76
  6. Step 6: Final answer
    x = 1,190.59

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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.