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Finding the Fourth Proportional to 780.27, 1,171.04 and 451.56

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Solution

The fourth proportional to 780.27, 1,171.04 and 451.56 is: 677.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.27 : 1,171.04 = 451.56 : x
  2. Step 2: Convert to fraction form
    780.27/1,171.04 = 451.56/x
  3. Step 3: Cross multiply
    780.27x = 1,171.04 × 451.56
  4. Step 4: Simplify right side
    780.27x = 528,794.82
  5. Step 5: Solve for x
    x = 528,794.82/780.27
  6. Step 6: Final answer
    x = 677.71

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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.