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Finding the Fourth Proportional to 709.43, 979.02 and 394.71

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Solution

The fourth proportional to 709.43, 979.02 and 394.71 is: 544.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.43 : 979.02 = 394.71 : x
  2. Step 2: Convert to fraction form
    709.43/979.02 = 394.71/x
  3. Step 3: Cross multiply
    709.43x = 979.02 × 394.71
  4. Step 4: Simplify right side
    709.43x = 386,428.98
  5. Step 5: Solve for x
    x = 386,428.98/709.43
  6. Step 6: Final answer
    x = 544.70

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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.