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Finding the Fourth Proportional to 2,620.13, 3,929.90 and 672.35

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Solution

The fourth proportional to 2,620.13, 3,929.90 and 672.35 is: 1,008.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.13 : 3,929.90 = 672.35 : x
  2. Step 2: Convert to fraction form
    2,620.13/3,929.90 = 672.35/x
  3. Step 3: Cross multiply
    2,620.13x = 3,929.90 × 672.35
  4. Step 4: Simplify right side
    2,620.13x = 2,642,245.25
  5. Step 5: Solve for x
    x = 2,642,245.25/2,620.13
  6. Step 6: Final answer
    x = 1,008.44

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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.