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Finding the Fourth Proportional to 709.96, 979.72 and 395.21

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Solution

The fourth proportional to 709.96, 979.72 and 395.21 is: 545.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.96 : 979.72 = 395.21 : x
  2. Step 2: Convert to fraction form
    709.96/979.72 = 395.21/x
  3. Step 3: Cross multiply
    709.96x = 979.72 × 395.21
  4. Step 4: Simplify right side
    709.96x = 387,190.24
  5. Step 5: Solve for x
    x = 387,190.24/709.96
  6. Step 6: Final answer
    x = 545.37

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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.