Home / 1,987.28-2,742.01-1,201.31

Finding the Fourth Proportional to 1,987.28, 2,742.01 and 1,201.31

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Solution

The fourth proportional to 1,987.28, 2,742.01 and 1,201.31 is: 1,657.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.28 : 2,742.01 = 1,201.31 : x
  2. Step 2: Convert to fraction form
    1,987.28/2,742.01 = 1,201.31/x
  3. Step 3: Cross multiply
    1,987.28x = 2,742.01 × 1,201.31
  4. Step 4: Simplify right side
    1,987.28x = 3,293,998.03
  5. Step 5: Solve for x
    x = 3,293,998.03/1,987.28
  6. Step 6: Final answer
    x = 1,657.54

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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.