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Finding the Fourth Proportional to 812.46, 1,115.79 and 681.24

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Solution

The fourth proportional to 812.46, 1,115.79 and 681.24 is: 935.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.46 : 1,115.79 = 681.24 : x
  2. Step 2: Convert to fraction form
    812.46/1,115.79 = 681.24/x
  3. Step 3: Cross multiply
    812.46x = 1,115.79 × 681.24
  4. Step 4: Simplify right side
    812.46x = 760,120.78
  5. Step 5: Solve for x
    x = 760,120.78/812.46
  6. Step 6: Final answer
    x = 935.58

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.