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Finding the Fourth Proportional to 1,273.05, 1,908.90 and 451.20

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Solution

The fourth proportional to 1,273.05, 1,908.90 and 451.20 is: 676.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.05 : 1,908.90 = 451.20 : x
  2. Step 2: Convert to fraction form
    1,273.05/1,908.90 = 451.20/x
  3. Step 3: Cross multiply
    1,273.05x = 1,908.90 × 451.20
  4. Step 4: Simplify right side
    1,273.05x = 861,302.84
  5. Step 5: Solve for x
    x = 861,302.84/1,273.05
  6. Step 6: Final answer
    x = 676.57

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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.