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Finding the Fourth Proportional to 1,672.80, 2,511.90 and 1,262.40

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Solution

The fourth proportional to 1,672.80, 2,511.90 and 1,262.40 is: 1,895.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,672.80 : 2,511.90 = 1,262.40 : x
  2. Step 2: Convert to fraction form
    1,672.80/2,511.90 = 1,262.40/x
  3. Step 3: Cross multiply
    1,672.80x = 2,511.90 × 1,262.40
  4. Step 4: Simplify right side
    1,672.80x = 3,171,022.56
  5. Step 5: Solve for x
    x = 3,171,022.56/1,672.80
  6. Step 6: Final answer
    x = 1,895.64

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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.