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Finding the Fourth Proportional to 629.34, 867.96 and 405.31

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Solution

The fourth proportional to 629.34, 867.96 and 405.31 is: 558.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.34 : 867.96 = 405.31 : x
  2. Step 2: Convert to fraction form
    629.34/867.96 = 405.31/x
  3. Step 3: Cross multiply
    629.34x = 867.96 × 405.31
  4. Step 4: Simplify right side
    629.34x = 351,792.87
  5. Step 5: Solve for x
    x = 351,792.87/629.34
  6. Step 6: Final answer
    x = 558.99

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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.