Home / 1,987.39-2,742.46-1,191.16

Finding the Fourth Proportional to 1,987.39, 2,742.46 and 1,191.16

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Solution

The fourth proportional to 1,987.39, 2,742.46 and 1,191.16 is: 1,643.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.39 : 2,742.46 = 1,191.16 : x
  2. Step 2: Convert to fraction form
    1,987.39/2,742.46 = 1,191.16/x
  3. Step 3: Cross multiply
    1,987.39x = 2,742.46 × 1,191.16
  4. Step 4: Simplify right side
    1,987.39x = 3,266,693.68
  5. Step 5: Solve for x
    x = 3,266,693.68/1,987.39
  6. Step 6: Final answer
    x = 1,643.71

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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.