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Finding the Fourth Proportional to 1,092.76, 1,639.38 and 768.28

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Solution

The fourth proportional to 1,092.76, 1,639.38 and 768.28 is: 1,152.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,092.76 : 1,639.38 = 768.28 : x
  2. Step 2: Convert to fraction form
    1,092.76/1,639.38 = 768.28/x
  3. Step 3: Cross multiply
    1,092.76x = 1,639.38 × 768.28
  4. Step 4: Simplify right side
    1,092.76x = 1,259,502.87
  5. Step 5: Solve for x
    x = 1,259,502.87/1,092.76
  6. Step 6: Final answer
    x = 1,152.59

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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.