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Finding the Fourth Proportional to 838.68, 1,156 and 768.96

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Solution

The fourth proportional to 838.68, 1,156 and 768.96 is: 1,059.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.68 : 1,156 = 768.96 : x
  2. Step 2: Convert to fraction form
    838.68/1,156 = 768.96/x
  3. Step 3: Cross multiply
    838.68x = 1,156 × 768.96
  4. Step 4: Simplify right side
    838.68x = 888,917.76
  5. Step 5: Solve for x
    x = 888,917.76/838.68
  6. Step 6: Final answer
    x = 1,059.90

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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.