Home / 1,720.32-2,581.50-680.43

Finding the Fourth Proportional to 1,720.32, 2,581.50 and 680.43

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Solution

The fourth proportional to 1,720.32, 2,581.50 and 680.43 is: 1,021.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.32 : 2,581.50 = 680.43 : x
  2. Step 2: Convert to fraction form
    1,720.32/2,581.50 = 680.43/x
  3. Step 3: Cross multiply
    1,720.32x = 2,581.50 × 680.43
  4. Step 4: Simplify right side
    1,720.32x = 1,756,530.05
  5. Step 5: Solve for x
    x = 1,756,530.05/1,720.32
  6. Step 6: Final answer
    x = 1,021.05

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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.