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Finding the Fourth Proportional to 1,720.56, 2,579.25 and 842.55

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Solution

The fourth proportional to 1,720.56, 2,579.25 and 842.55 is: 1,263.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.56 : 2,579.25 = 842.55 : x
  2. Step 2: Convert to fraction form
    1,720.56/2,579.25 = 842.55/x
  3. Step 3: Cross multiply
    1,720.56x = 2,579.25 × 842.55
  4. Step 4: Simplify right side
    1,720.56x = 2,173,147.09
  5. Step 5: Solve for x
    x = 2,173,147.09/1,720.56
  6. Step 6: Final answer
    x = 1,263.05

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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.