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Finding the Fourth Proportional to 1,273.05, 1,909.56 and 451.56

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Solution

The fourth proportional to 1,273.05, 1,909.56 and 451.56 is: 677.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.05 : 1,909.56 = 451.56 : x
  2. Step 2: Convert to fraction form
    1,273.05/1,909.56 = 451.56/x
  3. Step 3: Cross multiply
    1,273.05x = 1,909.56 × 451.56
  4. Step 4: Simplify right side
    1,273.05x = 862,280.91
  5. Step 5: Solve for x
    x = 862,280.91/1,273.05
  6. Step 6: Final answer
    x = 677.33

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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.