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Finding the Fourth Proportional to 2,002.80, 2,763 and 1,380.72

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Solution

The fourth proportional to 2,002.80, 2,763 and 1,380.72 is: 1,904.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,002.80 : 2,763 = 1,380.72 : x
  2. Step 2: Convert to fraction form
    2,002.80/2,763 = 1,380.72/x
  3. Step 3: Cross multiply
    2,002.80x = 2,763 × 1,380.72
  4. Step 4: Simplify right side
    2,002.80x = 3,814,929.36
  5. Step 5: Solve for x
    x = 3,814,929.36/2,002.80
  6. Step 6: Final answer
    x = 1,904.80

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1.5x scale

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.