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Finding the Fourth Proportional to 1,720.71, 2,375.78 and 1,272.69

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Solution

The fourth proportional to 1,720.71, 2,375.78 and 1,272.69 is: 1,757.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.71 : 2,375.78 = 1,272.69 : x
  2. Step 2: Convert to fraction form
    1,720.71/2,375.78 = 1,272.69/x
  3. Step 3: Cross multiply
    1,720.71x = 2,375.78 × 1,272.69
  4. Step 4: Simplify right side
    1,720.71x = 3,023,625.08
  5. Step 5: Solve for x
    x = 3,023,625.08/1,720.71
  6. Step 6: Final answer
    x = 1,757.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.