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Finding the Fourth Proportional to 708.29, 976.91 and 428.44

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Solution

The fourth proportional to 708.29, 976.91 and 428.44 is: 590.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.29 : 976.91 = 428.44 : x
  2. Step 2: Convert to fraction form
    708.29/976.91 = 428.44/x
  3. Step 3: Cross multiply
    708.29x = 976.91 × 428.44
  4. Step 4: Simplify right side
    708.29x = 418,546.98
  5. Step 5: Solve for x
    x = 418,546.98/708.29
  6. Step 6: Final answer
    x = 590.92

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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.