Home / 1,987.60-2,742-1,201.18

Finding the Fourth Proportional to 1,987.60, 2,742 and 1,201.18

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Solution

The fourth proportional to 1,987.60, 2,742 and 1,201.18 is: 1,657.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.60 : 2,742 = 1,201.18 : x
  2. Step 2: Convert to fraction form
    1,987.60/2,742 = 1,201.18/x
  3. Step 3: Cross multiply
    1,987.60x = 2,742 × 1,201.18
  4. Step 4: Simplify right side
    1,987.60x = 3,293,635.56
  5. Step 5: Solve for x
    x = 3,293,635.56/1,987.60
  6. Step 6: Final answer
    x = 1,657.09

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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.