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Finding the Fourth Proportional to 855.77, 1,180.78 and 519.62

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Solution

The fourth proportional to 855.77, 1,180.78 and 519.62 is: 716.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.77 : 1,180.78 = 519.62 : x
  2. Step 2: Convert to fraction form
    855.77/1,180.78 = 519.62/x
  3. Step 3: Cross multiply
    855.77x = 1,180.78 × 519.62
  4. Step 4: Simplify right side
    855.77x = 613,549.70
  5. Step 5: Solve for x
    x = 613,549.70/855.77
  6. Step 6: Final answer
    x = 716.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.