Home / 1,987.01-2,742.19-1,147.87

Finding the Fourth Proportional to 1,987.01, 2,742.19 and 1,147.87

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Solution

The fourth proportional to 1,987.01, 2,742.19 and 1,147.87 is: 1,584.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.01 : 2,742.19 = 1,147.87 : x
  2. Step 2: Convert to fraction form
    1,987.01/2,742.19 = 1,147.87/x
  3. Step 3: Cross multiply
    1,987.01x = 2,742.19 × 1,147.87
  4. Step 4: Simplify right side
    1,987.01x = 3,147,663.92
  5. Step 5: Solve for x
    x = 3,147,663.92/1,987.01
  6. Step 6: Final answer
    x = 1,584.12

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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.