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Finding the Fourth Proportional to 629.96, 868.72 and 489.82

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Solution

The fourth proportional to 629.96, 868.72 and 489.82 is: 675.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.96 : 868.72 = 489.82 : x
  2. Step 2: Convert to fraction form
    629.96/868.72 = 489.82/x
  3. Step 3: Cross multiply
    629.96x = 868.72 × 489.82
  4. Step 4: Simplify right side
    629.96x = 425,516.43
  5. Step 5: Solve for x
    x = 425,516.43/629.96
  6. Step 6: Final answer
    x = 675.47

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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.