Home / 2,689.90-4,032.38-1,388.64

Finding the Fourth Proportional to 2,689.90, 4,032.38 and 1,388.64

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Solution

The fourth proportional to 2,689.90, 4,032.38 and 1,388.64 is: 2,081.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.90 : 4,032.38 = 1,388.64 : x
  2. Step 2: Convert to fraction form
    2,689.90/4,032.38 = 1,388.64/x
  3. Step 3: Cross multiply
    2,689.90x = 4,032.38 × 1,388.64
  4. Step 4: Simplify right side
    2,689.90x = 5,599,524.16
  5. Step 5: Solve for x
    x = 5,599,524.16/2,689.90
  6. Step 6: Final answer
    x = 2,081.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.