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Finding the Fourth Proportional to 629.96, 868.31 and 490.02

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Solution

The fourth proportional to 629.96, 868.31 and 490.02 is: 675.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.96 : 868.31 = 490.02 : x
  2. Step 2: Convert to fraction form
    629.96/868.31 = 490.02/x
  3. Step 3: Cross multiply
    629.96x = 868.31 × 490.02
  4. Step 4: Simplify right side
    629.96x = 425,492.03
  5. Step 5: Solve for x
    x = 425,492.03/629.96
  6. Step 6: Final answer
    x = 675.43

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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.