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Finding the Fourth Proportional to 800, 1,101.66 and 766.28

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Solution

The fourth proportional to 800, 1,101.66 and 766.28 is: 1,055.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    800 : 1,101.66 = 766.28 : x
  2. Step 2: Convert to fraction form
    800/1,101.66 = 766.28/x
  3. Step 3: Cross multiply
    800x = 1,101.66 × 766.28
  4. Step 4: Simplify right side
    800x = 844,180.02
  5. Step 5: Solve for x
    x = 844,180.02/800
  6. Step 6: Final answer
    x = 1,055.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.