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Finding the Fourth Proportional to 709.65, 979.25 and 394.87

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Solution

The fourth proportional to 709.65, 979.25 and 394.87 is: 544.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.65 : 979.25 = 394.87 : x
  2. Step 2: Convert to fraction form
    709.65/979.25 = 394.87/x
  3. Step 3: Cross multiply
    709.65x = 979.25 × 394.87
  4. Step 4: Simplify right side
    709.65x = 386,676.45
  5. Step 5: Solve for x
    x = 386,676.45/709.65
  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.