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Finding the Fourth Proportional to 1,679.75, 2,519.99 and 653.75

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Solution

The fourth proportional to 1,679.75, 2,519.99 and 653.75 is: 980.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.75 : 2,519.99 = 653.75 : x
  2. Step 2: Convert to fraction form
    1,679.75/2,519.99 = 653.75/x
  3. Step 3: Cross multiply
    1,679.75x = 2,519.99 × 653.75
  4. Step 4: Simplify right side
    1,679.75x = 1,647,443.46
  5. Step 5: Solve for x
    x = 1,647,443.46/1,679.75
  6. Step 6: Final answer
    x = 980.77

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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.