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Finding the Fourth Proportional to 1,091.76, 1,639.28 and 683.48

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Solution

The fourth proportional to 1,091.76, 1,639.28 and 683.48 is: 1,026.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.76 : 1,639.28 = 683.48 : x
  2. Step 2: Convert to fraction form
    1,091.76/1,639.28 = 683.48/x
  3. Step 3: Cross multiply
    1,091.76x = 1,639.28 × 683.48
  4. Step 4: Simplify right side
    1,091.76x = 1,120,415.09
  5. Step 5: Solve for x
    x = 1,120,415.09/1,091.76
  6. Step 6: Final answer
    x = 1,026.25

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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.