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Finding the Fourth Proportional to 2,139.98, 3,210 and 680.36

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Solution

The fourth proportional to 2,139.98, 3,210 and 680.36 is: 1,020.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.98 : 3,210 = 680.36 : x
  2. Step 2: Convert to fraction form
    2,139.98/3,210 = 680.36/x
  3. Step 3: Cross multiply
    2,139.98x = 3,210 × 680.36
  4. Step 4: Simplify right side
    2,139.98x = 2,183,955.60
  5. Step 5: Solve for x
    x = 2,183,955.60/2,139.98
  6. Step 6: Final answer
    x = 1,020.55

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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.