Home / 1,680.24-2,519.97-639.87

Finding the Fourth Proportional to 1,680.24, 2,519.97 and 639.87

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Solution

The fourth proportional to 1,680.24, 2,519.97 and 639.87 is: 959.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.24 : 2,519.97 = 639.87 : x
  2. Step 2: Convert to fraction form
    1,680.24/2,519.97 = 639.87/x
  3. Step 3: Cross multiply
    1,680.24x = 2,519.97 × 639.87
  4. Step 4: Simplify right side
    1,680.24x = 1,612,440.60
  5. Step 5: Solve for x
    x = 1,612,440.60/1,680.24
  6. Step 6: Final answer
    x = 959.65

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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.