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Finding the Fourth Proportional to 667.31, 921.03 and 431.09

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Solution

The fourth proportional to 667.31, 921.03 and 431.09 is: 595.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.31 : 921.03 = 431.09 : x
  2. Step 2: Convert to fraction form
    667.31/921.03 = 431.09/x
  3. Step 3: Cross multiply
    667.31x = 921.03 × 431.09
  4. Step 4: Simplify right side
    667.31x = 397,046.82
  5. Step 5: Solve for x
    x = 397,046.82/667.31
  6. Step 6: Final answer
    x = 595.00

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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.