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Finding the Fourth Proportional to 626.44, 939.98 and 489.76

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Solution

The fourth proportional to 626.44, 939.98 and 489.76 is: 734.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.44 : 939.98 = 489.76 : x
  2. Step 2: Convert to fraction form
    626.44/939.98 = 489.76/x
  3. Step 3: Cross multiply
    626.44x = 939.98 × 489.76
  4. Step 4: Simplify right side
    626.44x = 460,364.60
  5. Step 5: Solve for x
    x = 460,364.60/626.44
  6. Step 6: Final answer
    x = 734.89

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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.