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Finding the Fourth Proportional to 1,299.75, 1,792.90 and 768.45

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Solution

The fourth proportional to 1,299.75, 1,792.90 and 768.45 is: 1,060.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.75 : 1,792.90 = 768.45 : x
  2. Step 2: Convert to fraction form
    1,299.75/1,792.90 = 768.45/x
  3. Step 3: Cross multiply
    1,299.75x = 1,792.90 × 768.45
  4. Step 4: Simplify right side
    1,299.75x = 1,377,750.88
  5. Step 5: Solve for x
    x = 1,377,750.88/1,299.75
  6. Step 6: Final answer
    x = 1,060.02

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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.