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Finding the Fourth Proportional to 1,720.80, 2,579.90 and 855.72

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Solution

The fourth proportional to 1,720.80, 2,579.90 and 855.72 is: 1,282.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.80 : 2,579.90 = 855.72 : x
  2. Step 2: Convert to fraction form
    1,720.80/2,579.90 = 855.72/x
  3. Step 3: Cross multiply
    1,720.80x = 2,579.90 × 855.72
  4. Step 4: Simplify right side
    1,720.80x = 2,207,672.03
  5. Step 5: Solve for x
    x = 2,207,672.03/1,720.80
  6. Step 6: Final answer
    x = 1,282.93

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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.