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Finding the Fourth Proportional to 1,720.80, 2,581.22 and 1,139.53

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Solution

The fourth proportional to 1,720.80, 2,581.22 and 1,139.53 is: 1,709.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.80 : 2,581.22 = 1,139.53 : x
  2. Step 2: Convert to fraction form
    1,720.80/2,581.22 = 1,139.53/x
  3. Step 3: Cross multiply
    1,720.80x = 2,581.22 × 1,139.53
  4. Step 4: Simplify right side
    1,720.80x = 2,941,377.63
  5. Step 5: Solve for x
    x = 2,941,377.63/1,720.80
  6. Step 6: Final answer
    x = 1,709.31

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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.