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Finding the Fourth Proportional to 2,726.80, 4,090.20 and 2,289.40

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Solution

The fourth proportional to 2,726.80, 4,090.20 and 2,289.40 is: 3,434.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,726.80 : 4,090.20 = 2,289.40 : x
  2. Step 2: Convert to fraction form
    2,726.80/4,090.20 = 2,289.40/x
  3. Step 3: Cross multiply
    2,726.80x = 4,090.20 × 2,289.40
  4. Step 4: Simplify right side
    2,726.80x = 9,364,103.88
  5. Step 5: Solve for x
    x = 9,364,103.88/2,726.80
  6. Step 6: Final answer
    x = 3,434.10

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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.