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Finding the Fourth Proportional to 1,091.32, 1,634.78 and 628.80

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Solution

The fourth proportional to 1,091.32, 1,634.78 and 628.80 is: 941.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.32 : 1,634.78 = 628.80 : x
  2. Step 2: Convert to fraction form
    1,091.32/1,634.78 = 628.80/x
  3. Step 3: Cross multiply
    1,091.32x = 1,634.78 × 628.80
  4. Step 4: Simplify right side
    1,091.32x = 1,027,949.66
  5. Step 5: Solve for x
    x = 1,027,949.66/1,091.32
  6. Step 6: Final answer
    x = 941.93

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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.