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Finding the Fourth Proportional to 1,687.70, 2,325.57 and 1,244.90

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Solution

The fourth proportional to 1,687.70, 2,325.57 and 1,244.90 is: 1,715.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.70 : 2,325.57 = 1,244.90 : x
  2. Step 2: Convert to fraction form
    1,687.70/2,325.57 = 1,244.90/x
  3. Step 3: Cross multiply
    1,687.70x = 2,325.57 × 1,244.90
  4. Step 4: Simplify right side
    1,687.70x = 2,895,102.09
  5. Step 5: Solve for x
    x = 2,895,102.09/1,687.70
  6. Step 6: Final answer
    x = 1,715.41

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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.