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Finding the Fourth Proportional to 1,720.80, 2,579.40 and 842.09

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Solution

The fourth proportional to 1,720.80, 2,579.40 and 842.09 is: 1,262.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.80 : 2,579.40 = 842.09 : x
  2. Step 2: Convert to fraction form
    1,720.80/2,579.40 = 842.09/x
  3. Step 3: Cross multiply
    1,720.80x = 2,579.40 × 842.09
  4. Step 4: Simplify right side
    1,720.80x = 2,172,082.74
  5. Step 5: Solve for x
    x = 2,172,082.74/1,720.80
  6. Step 6: Final answer
    x = 1,262.25

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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.