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Finding the Fourth Proportional to 850.36, 1,173.78 and 518.80

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Solution

The fourth proportional to 850.36, 1,173.78 and 518.80 is: 716.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.36 : 1,173.78 = 518.80 : x
  2. Step 2: Convert to fraction form
    850.36/1,173.78 = 518.80/x
  3. Step 3: Cross multiply
    850.36x = 1,173.78 × 518.80
  4. Step 4: Simplify right side
    850.36x = 608,957.06
  5. Step 5: Solve for x
    x = 608,957.06/850.36
  6. Step 6: Final answer
    x = 716.12

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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.