Home / 1,987.90-2,741.79-1,201.12

Finding the Fourth Proportional to 1,987.90, 2,741.79 and 1,201.12

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Solution

The fourth proportional to 1,987.90, 2,741.79 and 1,201.12 is: 1,656.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.90 : 2,741.79 = 1,201.12 : x
  2. Step 2: Convert to fraction form
    1,987.90/2,741.79 = 1,201.12/x
  3. Step 3: Cross multiply
    1,987.90x = 2,741.79 × 1,201.12
  4. Step 4: Simplify right side
    1,987.90x = 3,293,218.80
  5. Step 5: Solve for x
    x = 3,293,218.80/1,987.90
  6. Step 6: Final answer
    x = 1,656.63

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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.