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Finding the Fourth Proportional to 2,687.90, 3,709.31 and 1,492.90

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Solution

The fourth proportional to 2,687.90, 3,709.31 and 1,492.90 is: 2,060.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.90 : 3,709.31 = 1,492.90 : x
  2. Step 2: Convert to fraction form
    2,687.90/3,709.31 = 1,492.90/x
  3. Step 3: Cross multiply
    2,687.90x = 3,709.31 × 1,492.90
  4. Step 4: Simplify right side
    2,687.90x = 5,537,623.36
  5. Step 5: Solve for x
    x = 5,537,623.36/2,687.90
  6. Step 6: Final answer
    x = 2,060.21

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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.