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Finding the Fourth Proportional to 1,122.66, 1,683.90 and 759.78

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Solution

The fourth proportional to 1,122.66, 1,683.90 and 759.78 is: 1,139.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.66 : 1,683.90 = 759.78 : x
  2. Step 2: Convert to fraction form
    1,122.66/1,683.90 = 759.78/x
  3. Step 3: Cross multiply
    1,122.66x = 1,683.90 × 759.78
  4. Step 4: Simplify right side
    1,122.66x = 1,279,393.54
  5. Step 5: Solve for x
    x = 1,279,393.54/1,122.66
  6. Step 6: Final answer
    x = 1,139.61

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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.