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Finding the Fourth Proportional to 811.37, 1,120.68 and 700.80

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Solution

The fourth proportional to 811.37, 1,120.68 and 700.80 is: 967.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.37 : 1,120.68 = 700.80 : x
  2. Step 2: Convert to fraction form
    811.37/1,120.68 = 700.80/x
  3. Step 3: Cross multiply
    811.37x = 1,120.68 × 700.80
  4. Step 4: Simplify right side
    811.37x = 785,372.54
  5. Step 5: Solve for x
    x = 785,372.54/811.37
  6. Step 6: Final answer
    x = 967.96

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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.