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Finding the Fourth Proportional to 679.96, 938.20 and 431.32

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Solution

The fourth proportional to 679.96, 938.20 and 431.32 is: 595.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.96 : 938.20 = 431.32 : x
  2. Step 2: Convert to fraction form
    679.96/938.20 = 431.32/x
  3. Step 3: Cross multiply
    679.96x = 938.20 × 431.32
  4. Step 4: Simplify right side
    679.96x = 404,664.42
  5. Step 5: Solve for x
    x = 404,664.42/679.96
  6. Step 6: Final answer
    x = 595.13

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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.