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Finding the Fourth Proportional to 2,687.80, 3,707.20 and 1,640.20

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Solution

The fourth proportional to 2,687.80, 3,707.20 and 1,640.20 is: 2,262.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.80 : 3,707.20 = 1,640.20 : x
  2. Step 2: Convert to fraction form
    2,687.80/3,707.20 = 1,640.20/x
  3. Step 3: Cross multiply
    2,687.80x = 3,707.20 × 1,640.20
  4. Step 4: Simplify right side
    2,687.80x = 6,080,549.44
  5. Step 5: Solve for x
    x = 6,080,549.44/2,687.80
  6. Step 6: Final answer
    x = 2,262.28

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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.