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Finding the Fourth Proportional to 891.33, 1,229.74 and 681.81

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Solution

The fourth proportional to 891.33, 1,229.74 and 681.81 is: 940.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.33 : 1,229.74 = 681.81 : x
  2. Step 2: Convert to fraction form
    891.33/1,229.74 = 681.81/x
  3. Step 3: Cross multiply
    891.33x = 1,229.74 × 681.81
  4. Step 4: Simplify right side
    891.33x = 838,449.03
  5. Step 5: Solve for x
    x = 838,449.03/891.33
  6. Step 6: Final answer
    x = 940.67

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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.