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Finding the Fourth Proportional to 3,260.50, 4,890.82 and 920.49

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Solution

The fourth proportional to 3,260.50, 4,890.82 and 920.49 is: 1,380.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,260.50 : 4,890.82 = 920.49 : x
  2. Step 2: Convert to fraction form
    3,260.50/4,890.82 = 920.49/x
  3. Step 3: Cross multiply
    3,260.50x = 4,890.82 × 920.49
  4. Step 4: Simplify right side
    3,260.50x = 4,501,950.90
  5. Step 5: Solve for x
    x = 4,501,950.90/3,260.50
  6. Step 6: Final answer
    x = 1,380.75

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Double scale
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Similar ratio
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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.