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Finding the Fourth Proportional to 709.82, 979.67 and 678.68

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Solution

The fourth proportional to 709.82, 979.67 and 678.68 is: 936.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.82 : 979.67 = 678.68 : x
  2. Step 2: Convert to fraction form
    709.82/979.67 = 678.68/x
  3. Step 3: Cross multiply
    709.82x = 979.67 × 678.68
  4. Step 4: Simplify right side
    709.82x = 664,882.44
  5. Step 5: Solve for x
    x = 664,882.44/709.82
  6. Step 6: Final answer
    x = 936.70

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Double scale
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1.5x scale

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.