Home / 1,971.42-2,719.41-1,272.80

Finding the Fourth Proportional to 1,971.42, 2,719.41 and 1,272.80

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Solution

The fourth proportional to 1,971.42, 2,719.41 and 1,272.80 is: 1,755.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.42 : 2,719.41 = 1,272.80 : x
  2. Step 2: Convert to fraction form
    1,971.42/2,719.41 = 1,272.80/x
  3. Step 3: Cross multiply
    1,971.42x = 2,719.41 × 1,272.80
  4. Step 4: Simplify right side
    1,971.42x = 3,461,251.45
  5. Step 5: Solve for x
    x = 3,461,251.45/1,971.42
  6. Step 6: Final answer
    x = 1,755.71

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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.