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Finding the Fourth Proportional to 709.55, 979.22 and 394.88

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Solution

The fourth proportional to 709.55, 979.22 and 394.88 is: 544.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.55 : 979.22 = 394.88 : x
  2. Step 2: Convert to fraction form
    709.55/979.22 = 394.88/x
  3. Step 3: Cross multiply
    709.55x = 979.22 × 394.88
  4. Step 4: Simplify right side
    709.55x = 386,677.83
  5. Step 5: Solve for x
    x = 386,677.83/709.55
  6. Step 6: Final answer
    x = 544.96

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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.