Home / 2,140.20-3,210.61-679.48

Finding the Fourth Proportional to 2,140.20, 3,210.61 and 679.48

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Solution

The fourth proportional to 2,140.20, 3,210.61 and 679.48 is: 1,019.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.20 : 3,210.61 = 679.48 : x
  2. Step 2: Convert to fraction form
    2,140.20/3,210.61 = 679.48/x
  3. Step 3: Cross multiply
    2,140.20x = 3,210.61 × 679.48
  4. Step 4: Simplify right side
    2,140.20x = 2,181,543.58
  5. Step 5: Solve for x
    x = 2,181,543.58/2,140.20
  6. Step 6: Final answer
    x = 1,019.32

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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.