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Finding the Fourth Proportional to 1,299.40, 1,792.64 and 739.79

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Solution

The fourth proportional to 1,299.40, 1,792.64 and 739.79 is: 1,020.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.40 : 1,792.64 = 739.79 : x
  2. Step 2: Convert to fraction form
    1,299.40/1,792.64 = 739.79/x
  3. Step 3: Cross multiply
    1,299.40x = 1,792.64 × 739.79
  4. Step 4: Simplify right side
    1,299.40x = 1,326,177.15
  5. Step 5: Solve for x
    x = 1,326,177.15/1,299.40
  6. Step 6: Final answer
    x = 1,020.61

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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.