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Finding the Fourth Proportional to 1,640.21, 2,460.68 and 485.96

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Solution

The fourth proportional to 1,640.21, 2,460.68 and 485.96 is: 729.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.21 : 2,460.68 = 485.96 : x
  2. Step 2: Convert to fraction form
    1,640.21/2,460.68 = 485.96/x
  3. Step 3: Cross multiply
    1,640.21x = 2,460.68 × 485.96
  4. Step 4: Simplify right side
    1,640.21x = 1,195,789.62
  5. Step 5: Solve for x
    x = 1,195,789.62/1,640.21
  6. Step 6: Final answer
    x = 729.05

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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.