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Finding the Fourth Proportional to 1,299.20, 1,792.92 and 709.79

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Solution

The fourth proportional to 1,299.20, 1,792.92 and 709.79 is: 979.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.20 : 1,792.92 = 709.79 : x
  2. Step 2: Convert to fraction form
    1,299.20/1,792.92 = 709.79/x
  3. Step 3: Cross multiply
    1,299.20x = 1,792.92 × 709.79
  4. Step 4: Simplify right side
    1,299.20x = 1,272,587.72
  5. Step 5: Solve for x
    x = 1,272,587.72/1,299.20
  6. Step 6: Final answer
    x = 979.52

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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.