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Finding the Fourth Proportional to 809.44, 1,116.35 and 685.38

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Solution

The fourth proportional to 809.44, 1,116.35 and 685.38 is: 945.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.44 : 1,116.35 = 685.38 : x
  2. Step 2: Convert to fraction form
    809.44/1,116.35 = 685.38/x
  3. Step 3: Cross multiply
    809.44x = 1,116.35 × 685.38
  4. Step 4: Simplify right side
    809.44x = 765,114.95
  5. Step 5: Solve for x
    x = 765,114.95/809.44
  6. Step 6: Final answer
    x = 945.24

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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.