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Finding the Fourth Proportional to 680.32, 938.89 and 431.70

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Solution

The fourth proportional to 680.32, 938.89 and 431.70 is: 595.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.32 : 938.89 = 431.70 : x
  2. Step 2: Convert to fraction form
    680.32/938.89 = 431.70/x
  3. Step 3: Cross multiply
    680.32x = 938.89 × 431.70
  4. Step 4: Simplify right side
    680.32x = 405,323.75
  5. Step 5: Solve for x
    x = 405,323.75/680.32
  6. Step 6: Final answer
    x = 595.78

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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.