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Finding the Fourth Proportional to 811.38, 1,118.43 and 712.98

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Solution

The fourth proportional to 811.38, 1,118.43 and 712.98 is: 982.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.38 : 1,118.43 = 712.98 : x
  2. Step 2: Convert to fraction form
    811.38/1,118.43 = 712.98/x
  3. Step 3: Cross multiply
    811.38x = 1,118.43 × 712.98
  4. Step 4: Simplify right side
    811.38x = 797,418.22
  5. Step 5: Solve for x
    x = 797,418.22/811.38
  6. Step 6: Final answer
    x = 982.79

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Double scale
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1.5x scale

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.