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Finding the Fourth Proportional to 2,540.90, 3,506.78 and 1,421.90

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Solution

The fourth proportional to 2,540.90, 3,506.78 and 1,421.90 is: 1,962.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,540.90 : 3,506.78 = 1,421.90 : x
  2. Step 2: Convert to fraction form
    2,540.90/3,506.78 = 1,421.90/x
  3. Step 3: Cross multiply
    2,540.90x = 3,506.78 × 1,421.90
  4. Step 4: Simplify right side
    2,540.90x = 4,986,290.48
  5. Step 5: Solve for x
    x = 4,986,290.48/2,540.90
  6. Step 6: Final answer
    x = 1,962.41

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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.