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Finding the Fourth Proportional to 1,265.92, 1,747.12 and 768.64

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Solution

The fourth proportional to 1,265.92, 1,747.12 and 768.64 is: 1,060.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.92 : 1,747.12 = 768.64 : x
  2. Step 2: Convert to fraction form
    1,265.92/1,747.12 = 768.64/x
  3. Step 3: Cross multiply
    1,265.92x = 1,747.12 × 768.64
  4. Step 4: Simplify right side
    1,265.92x = 1,342,906.32
  5. Step 5: Solve for x
    x = 1,342,906.32/1,265.92
  6. Step 6: Final answer
    x = 1,060.81

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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.