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Finding the Fourth Proportional to 786.82, 1,180.26 and 209.70

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Solution

The fourth proportional to 786.82, 1,180.26 and 209.70 is: 314.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.82 : 1,180.26 = 209.70 : x
  2. Step 2: Convert to fraction form
    786.82/1,180.26 = 209.70/x
  3. Step 3: Cross multiply
    786.82x = 1,180.26 × 209.70
  4. Step 4: Simplify right side
    786.82x = 247,500.52
  5. Step 5: Solve for x
    x = 247,500.52/786.82
  6. Step 6: Final answer
    x = 314.56

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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.