Home / 1,987.90-2,743.31-1,201.79

Finding the Fourth Proportional to 1,987.90, 2,743.31 and 1,201.79

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Solution

The fourth proportional to 1,987.90, 2,743.31 and 1,201.79 is: 1,658.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.90 : 2,743.31 = 1,201.79 : x
  2. Step 2: Convert to fraction form
    1,987.90/2,743.31 = 1,201.79/x
  3. Step 3: Cross multiply
    1,987.90x = 2,743.31 × 1,201.79
  4. Step 4: Simplify right side
    1,987.90x = 3,296,892.39
  5. Step 5: Solve for x
    x = 3,296,892.39/1,987.90
  6. Step 6: Final answer
    x = 1,658.48

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1.5x scale

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.