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Finding the Fourth Proportional to 1,687.72, 2,527.90 and 820.20

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Solution

The fourth proportional to 1,687.72, 2,527.90 and 820.20 is: 1,228.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.72 : 2,527.90 = 820.20 : x
  2. Step 2: Convert to fraction form
    1,687.72/2,527.90 = 820.20/x
  3. Step 3: Cross multiply
    1,687.72x = 2,527.90 × 820.20
  4. Step 4: Simplify right side
    1,687.72x = 2,073,383.58
  5. Step 5: Solve for x
    x = 2,073,383.58/1,687.72
  6. Step 6: Final answer
    x = 1,228.51

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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.