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Finding the Fourth Proportional to 626.65, 939.94 and 489.80

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Solution

The fourth proportional to 626.65, 939.94 and 489.80 is: 734.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.65 : 939.94 = 489.80 : x
  2. Step 2: Convert to fraction form
    626.65/939.94 = 489.80/x
  3. Step 3: Cross multiply
    626.65x = 939.94 × 489.80
  4. Step 4: Simplify right side
    626.65x = 460,383.74
  5. Step 5: Solve for x
    x = 460,383.74/626.65
  6. Step 6: Final answer
    x = 734.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.