Home / 1,971.12-2,719.80-1,131.60

Finding the Fourth Proportional to 1,971.12, 2,719.80 and 1,131.60

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Solution

The fourth proportional to 1,971.12, 2,719.80 and 1,131.60 is: 1,561.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.12 : 2,719.80 = 1,131.60 : x
  2. Step 2: Convert to fraction form
    1,971.12/2,719.80 = 1,131.60/x
  3. Step 3: Cross multiply
    1,971.12x = 2,719.80 × 1,131.60
  4. Step 4: Simplify right side
    1,971.12x = 3,077,725.68
  5. Step 5: Solve for x
    x = 3,077,725.68/1,971.12
  6. Step 6: Final answer
    x = 1,561.41

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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.