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Finding the Fourth Proportional to 2,687.70, 3,709.02 and 1,508.78

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Solution

The fourth proportional to 2,687.70, 3,709.02 and 1,508.78 is: 2,082.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.70 : 3,709.02 = 1,508.78 : x
  2. Step 2: Convert to fraction form
    2,687.70/3,709.02 = 1,508.78/x
  3. Step 3: Cross multiply
    2,687.70x = 3,709.02 × 1,508.78
  4. Step 4: Simplify right side
    2,687.70x = 5,596,076.65
  5. Step 5: Solve for x
    x = 5,596,076.65/2,687.70
  6. Step 6: Final answer
    x = 2,082.11

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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.