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Finding the Fourth Proportional to 2,672.55, 3,687.80 and 1,553.67

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Solution

The fourth proportional to 2,672.55, 3,687.80 and 1,553.67 is: 2,143.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,672.55 : 3,687.80 = 1,553.67 : x
  2. Step 2: Convert to fraction form
    2,672.55/3,687.80 = 1,553.67/x
  3. Step 3: Cross multiply
    2,672.55x = 3,687.80 × 1,553.67
  4. Step 4: Simplify right side
    2,672.55x = 5,729,616.46
  5. Step 5: Solve for x
    x = 5,729,616.46/2,672.55
  6. Step 6: Final answer
    x = 2,143.88

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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.