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Finding the Fourth Proportional to 850.54, 1,170.84 and 663.70

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Solution

The fourth proportional to 850.54, 1,170.84 and 663.70 is: 913.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.54 : 1,170.84 = 663.70 : x
  2. Step 2: Convert to fraction form
    850.54/1,170.84 = 663.70/x
  3. Step 3: Cross multiply
    850.54x = 1,170.84 × 663.70
  4. Step 4: Simplify right side
    850.54x = 777,086.51
  5. Step 5: Solve for x
    x = 777,086.51/850.54
  6. Step 6: Final answer
    x = 913.64

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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.