Home / 1,987.87-2,742.60-1,324.81

Finding the Fourth Proportional to 1,987.87, 2,742.60 and 1,324.81

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Solution

The fourth proportional to 1,987.87, 2,742.60 and 1,324.81 is: 1,827.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.87 : 2,742.60 = 1,324.81 : x
  2. Step 2: Convert to fraction form
    1,987.87/2,742.60 = 1,324.81/x
  3. Step 3: Cross multiply
    1,987.87x = 2,742.60 × 1,324.81
  4. Step 4: Simplify right side
    1,987.87x = 3,633,423.91
  5. Step 5: Solve for x
    x = 3,633,423.91/1,987.87
  6. Step 6: Final answer
    x = 1,827.80

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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.