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Finding the Fourth Proportional to 1,651.40, 2,469.90 and 1,392.20

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Solution

The fourth proportional to 1,651.40, 2,469.90 and 1,392.20 is: 2,082.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,651.40 : 2,469.90 = 1,392.20 : x
  2. Step 2: Convert to fraction form
    1,651.40/2,469.90 = 1,392.20/x
  3. Step 3: Cross multiply
    1,651.40x = 2,469.90 × 1,392.20
  4. Step 4: Simplify right side
    1,651.40x = 3,438,594.78
  5. Step 5: Solve for x
    x = 3,438,594.78/1,651.40
  6. Step 6: Final answer
    x = 2,082.23

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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.