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Finding the Fourth Proportional to 626.50, 939.60 and 279.65

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Solution

The fourth proportional to 626.50, 939.60 and 279.65 is: 419.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.50 : 939.60 = 279.65 : x
  2. Step 2: Convert to fraction form
    626.50/939.60 = 279.65/x
  3. Step 3: Cross multiply
    626.50x = 939.60 × 279.65
  4. Step 4: Simplify right side
    626.50x = 262,755.54
  5. Step 5: Solve for x
    x = 262,755.54/626.50
  6. Step 6: Final answer
    x = 419.40

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1.5x scale

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.