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Finding the Fourth Proportional to 680.13, 938.21 and 431.36

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Solution

The fourth proportional to 680.13, 938.21 and 431.36 is: 595.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.13 : 938.21 = 431.36 : x
  2. Step 2: Convert to fraction form
    680.13/938.21 = 431.36/x
  3. Step 3: Cross multiply
    680.13x = 938.21 × 431.36
  4. Step 4: Simplify right side
    680.13x = 404,706.27
  5. Step 5: Solve for x
    x = 404,706.27/680.13
  6. Step 6: Final answer
    x = 595.04

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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.