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Finding the Fourth Proportional to 3,260.82, 4,890.30 and 920.68

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Solution

The fourth proportional to 3,260.82, 4,890.30 and 920.68 is: 1,380.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,260.82 : 4,890.30 = 920.68 : x
  2. Step 2: Convert to fraction form
    3,260.82/4,890.30 = 920.68/x
  3. Step 3: Cross multiply
    3,260.82x = 4,890.30 × 920.68
  4. Step 4: Simplify right side
    3,260.82x = 4,502,401.40
  5. Step 5: Solve for x
    x = 4,502,401.40/3,260.82
  6. Step 6: Final answer
    x = 1,380.76

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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.