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Finding the Fourth Proportional to 1,276.05, 1,912.41 and 756.03

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Solution

The fourth proportional to 1,276.05, 1,912.41 and 756.03 is: 1,133.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.05 : 1,912.41 = 756.03 : x
  2. Step 2: Convert to fraction form
    1,276.05/1,912.41 = 756.03/x
  3. Step 3: Cross multiply
    1,276.05x = 1,912.41 × 756.03
  4. Step 4: Simplify right side
    1,276.05x = 1,445,846.50
  5. Step 5: Solve for x
    x = 1,445,846.50/1,276.05
  6. Step 6: Final answer
    x = 1,133.06

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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.