Home / 2,087.81-2,880.92-1,291.31

Finding the Fourth Proportional to 2,087.81, 2,880.92 and 1,291.31

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Solution

The fourth proportional to 2,087.81, 2,880.92 and 1,291.31 is: 1,781.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,087.81 : 2,880.92 = 1,291.31 : x
  2. Step 2: Convert to fraction form
    2,087.81/2,880.92 = 1,291.31/x
  3. Step 3: Cross multiply
    2,087.81x = 2,880.92 × 1,291.31
  4. Step 4: Simplify right side
    2,087.81x = 3,720,153.17
  5. Step 5: Solve for x
    x = 3,720,153.17/2,087.81
  6. Step 6: Final answer
    x = 1,781.85

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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.