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Finding the Fourth Proportional to 709.53, 979.15 and 394.79

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Solution

The fourth proportional to 709.53, 979.15 and 394.79 is: 544.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.53 : 979.15 = 394.79 : x
  2. Step 2: Convert to fraction form
    709.53/979.15 = 394.79/x
  3. Step 3: Cross multiply
    709.53x = 979.15 × 394.79
  4. Step 4: Simplify right side
    709.53x = 386,554.23
  5. Step 5: Solve for x
    x = 386,554.23/709.53
  6. Step 6: Final answer
    x = 544.80

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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.