Home / 1,987.40-2,742.86-1,201.88

Finding the Fourth Proportional to 1,987.40, 2,742.86 and 1,201.88

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Solution

The fourth proportional to 1,987.40, 2,742.86 and 1,201.88 is: 1,658.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.40 : 2,742.86 = 1,201.88 : x
  2. Step 2: Convert to fraction form
    1,987.40/2,742.86 = 1,201.88/x
  3. Step 3: Cross multiply
    1,987.40x = 2,742.86 × 1,201.88
  4. Step 4: Simplify right side
    1,987.40x = 3,296,588.58
  5. Step 5: Solve for x
    x = 3,296,588.58/1,987.40
  6. Step 6: Final answer
    x = 1,658.74

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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.