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Finding the Fourth Proportional to 709.83, 979.27 and 447.69

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Solution

The fourth proportional to 709.83, 979.27 and 447.69 is: 617.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.83 : 979.27 = 447.69 : x
  2. Step 2: Convert to fraction form
    709.83/979.27 = 447.69/x
  3. Step 3: Cross multiply
    709.83x = 979.27 × 447.69
  4. Step 4: Simplify right side
    709.83x = 438,406.94
  5. Step 5: Solve for x
    x = 438,406.94/709.83
  6. Step 6: Final answer
    x = 617.63

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Double scale
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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.