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Finding the Fourth Proportional to 709.39, 979.12 and 394.77

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Solution

The fourth proportional to 709.39, 979.12 and 394.77 is: 544.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.39 : 979.12 = 394.77 : x
  2. Step 2: Convert to fraction form
    709.39/979.12 = 394.77/x
  3. Step 3: Cross multiply
    709.39x = 979.12 × 394.77
  4. Step 4: Simplify right side
    709.39x = 386,531.37
  5. Step 5: Solve for x
    x = 386,531.37/709.39
  6. Step 6: Final answer
    x = 544.88

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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.