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Finding the Fourth Proportional to 629.40, 867.68 and 489.27

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Solution

The fourth proportional to 629.40, 867.68 and 489.27 is: 674.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.40 : 867.68 = 489.27 : x
  2. Step 2: Convert to fraction form
    629.40/867.68 = 489.27/x
  3. Step 3: Cross multiply
    629.40x = 867.68 × 489.27
  4. Step 4: Simplify right side
    629.40x = 424,527.35
  5. Step 5: Solve for x
    x = 424,527.35/629.40
  6. Step 6: Final answer
    x = 674.50

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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.