Home / 1,720.55-2,581.20-680.55

Finding the Fourth Proportional to 1,720.55, 2,581.20 and 680.55

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Solution

The fourth proportional to 1,720.55, 2,581.20 and 680.55 is: 1,020.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.55 : 2,581.20 = 680.55 : x
  2. Step 2: Convert to fraction form
    1,720.55/2,581.20 = 680.55/x
  3. Step 3: Cross multiply
    1,720.55x = 2,581.20 × 680.55
  4. Step 4: Simplify right side
    1,720.55x = 1,756,635.66
  5. Step 5: Solve for x
    x = 1,756,635.66/1,720.55
  6. Step 6: Final answer
    x = 1,020.98

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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.